As cataract surgery progresses from “restoration of sight” to “refractive correction”, precise prediction of intraocular lens (IOL) power is critical for enhancing postoperative visual quality in patients. IOL pow...As cataract surgery progresses from “restoration of sight” to “refractive correction”, precise prediction of intraocular lens (IOL) power is critical for enhancing postoperative visual quality in patients. IOL power calculation methods have evolved and innovated throughout time, from early theoretical and regression formulas to nonlinear formulas for estimating effective lens position (ELP), multivariable formulas, and innovative formulas that use optical principles and AI-based online formulas. This paper thoroughly discusses the development and iteration of traditional IOL calculation formulas, the emergence of new IOL calculation formulas, and the selection of IOL calculation formulas for different patients in the era of refractive cataract surgery, serving as a reference for “personalized” IOL implantation in clinical practice.展开更多
AIM:To assess whether the implantation of a posterior chamber phakic intraocular lens produces changes in optical coherence tomography(OCT)measurements of macular thickness(MT)and two parameters that define the struct...AIM:To assess whether the implantation of a posterior chamber phakic intraocular lens produces changes in optical coherence tomography(OCT)measurements of macular thickness(MT)and two parameters that define the structure of the optic nerve,the peripapillary nerve fiber layer(RNFL)and the Bruch’s membrane opening-minimum rim width(BMO-MRW).METHODS:This nonrandomized prospective pre-post study included 86 eyes of 48 patients(age,20-47y;axial length:23.10-28.95 mm)scheduled for myopia or myopic astigmatism correction with implantation of the implantable collamer lens(ICL).Eyes with glaucoma or any other ocular disease that could alter OCT results were excluded.RNFL,BMO-MRW and MT were measured preoperatively,and at 1 and 6mo after surgery using spectral-domain OCT.Changes between preoperative and postoperative values were evaluated.RESULTS:There was a significant increase in BMOMRW at 1mo(mean change:3.48±15.07μm,P=0.041).No significant changes were found during the rest of followup(1-6mo postop.,P=0.623).There was also a significant increase in RNFL thickness at 1mo af ter surger y(1.45±2.18μm,P<0.001),but with a significant reduction from 1 to 6mo postoperatively(P=0.002).Regarding MT,it increased significantly at 1mo(2.46±3.76μm,P<0.001),with a significant decrease afterwards(P=0.048).Measurements of the three parameters at 6mo were slightly superior to preoperative values(P<0.01).CONCLUSION:Minimal changes are induced in BMOMRW,RNFL and MT after ICL implantation in healthy eyes,confirming the safety of the surgical procedure regarding the structure of the optic nerve head and the macula,and indicating that this phakic intraocular lens seems to have a slight impact on OCT measurements.展开更多
Objective:To evaluate the performance of orthokeratology(ortho-k)lens reordering using software-designed system,so as to determine the feasibility of ortho-k lens reordering without discontinuing lens wear.Methods:Thi...Objective:To evaluate the performance of orthokeratology(ortho-k)lens reordering using software-designed system,so as to determine the feasibility of ortho-k lens reordering without discontinuing lens wear.Methods:This study is a retrospective analysis of data of ortho-k lens wearers who had a history of short-term discontinuation of lens wear.A total of 94 individuals aged over 8 years with spherical equivalent refraction ranging from-0.50 to-6.50 diopters were included.The corneal topography data at baseline(before ortho-k)and after lens wear discontinuation(cessation of ortho-k treatment)were imported separately into the lens-design software,along with corresponding refraction data.Subsequently,corneal and lens parameters were generated and compared.Intraclass correlation coefficients(ICC)were calculated,and Bland and Altman analyses were conducted.Results:All 94 children were involved in the retrospective analysis.Compared with baseline data,there was a high level of consistency between Rwo(without discontinuation)and Rwith(with discontinuation),with an ICC of 0.96(P<0.001).Furthermore,the comparison of lens parameters generated by the Easyfit software between baseline and after short-term discontinuation showed a high degree of consistency,with all of the ICC values exceeding 0.90.Similar results were obtained using the WAVE software,as both ICC values and Bland-Altman plots demonstrated a high level of consistency in lens parameters between two conditions(nearly all data points fell within the 95%LoAs).Conclusions:It is feasible to directly reorder new ortho-k lenses using software fitting approaches.However,further investigations are necessary to validate their practicability in a clinical setting.展开更多
Dear Editor,The latest Visian implantable collamer lens(ICL)with a central port design(Aquaport;model V4c)obviates the necessity for preoperative laser iridotomy or intraoperative iridectomy by allowing the free flow ...Dear Editor,The latest Visian implantable collamer lens(ICL)with a central port design(Aquaport;model V4c)obviates the necessity for preoperative laser iridotomy or intraoperative iridectomy by allowing the free flow of the aqueous humor between the sides of the intraocular lens.The design of Aquaport can also eliminate the complications associated with iridotomy and iridectomy.Therefore,the V4c ICL has the potential to significantly reduce the risk of pupillary block compared to its predecessors.展开更多
AIM:To compare the clinical outcomes of extended depth-of-focus intraocular lenses(EDOF IOLs)using either micromonovision implantation or mixed implantation of EDOF and diffractive bifocal IOLs.METHODS:This retrospect...AIM:To compare the clinical outcomes of extended depth-of-focus intraocular lenses(EDOF IOLs)using either micromonovision implantation or mixed implantation of EDOF and diffractive bifocal IOLs.METHODS:This retrospective clinical trial included 130 patients(260 eyes),who were divided into two groups.Group RR comprised 70 patients(140 eyes)bilaterally implanted with ZXR00 IOLs(Tecnis ZXR00,where one target was-0.5 D to-0.75 D and the other was 0 to-0.25 D).Group RM comprised 60 patients(120 eyes)unilaterally implanted with both ZXR00 and ZMB00 IOLs(Tecnis ZMB00,0 to-0.25 D).Postoperative outcomes were compared after 3 mo,including visual acuity,defocus curves,stereoacuity,modulation transfer functions(MTFs),higher-order aberrations,and Visual Function-14(VF-14)questionnaire responses.RESULTS:Group RR had superior bilateral intermediate vision,while the group RM had superior bilateral near vision(both P<0.05).Group RM also exhibited superior MTFs and reduced higher-order aberrations(both P<0.05).Stereoacuity and VF-14 questionnaire results showed no statistically significant difference between groups(P>0.05).CONCLUSION:The implantation of micromonovision has significantly improved near vision.IOLs and their collocation can be customized according to individual patient needs to achieve precise treatment and provide cataract patients with high-quality vision.展开更多
AIM:To evaluate the visual and refractive outcomes in cases after sutured scleral fixation of existing subluxated or dislocated acrylic one-piece intraocular lenses(IOLs).METHODS:This study retrospectively enrolled a ...AIM:To evaluate the visual and refractive outcomes in cases after sutured scleral fixation of existing subluxated or dislocated acrylic one-piece intraocular lenses(IOLs).METHODS:This study retrospectively enrolled a consecutive series of patients who underwent a surgery of sutured existing subluxated or dislocated IOLs from October 2018 to June 2020.All patients underwent comprehensive preoperative and postoperative ophthalmologic examination,and data were collected including age,sex,surgical indications,best-corrected visual acuity,refractive error,intraocular pressure.Presence of intraoperative and postoperative surgical complications was documented.RESULTS:A total of 20 consecutive cases were enrolled for analysis with mean final follow-up period 9.8±5.3mo.Visual acuity improved from a mean of 0.35(0.46±0.32 logMAR)preoperatively to 0.61(0.21±0.18 logMAR)at the 3-month follow-up(P=0.002).The mean amount of preoperative keratometric astigmatism and total postoperative refractive astigmatism was-1.24±0.80 diopters(D)and-1.42±0.97 D,respectively.There was no statistically significant difference between preoperative and postoperative astigmatism(P=0.156).The mean IOL-induced astigmatism was-0.23±0.53 D.The mean spherical equivalent at the 3-month follow-up was-0.1±0.94 D.No major complications were noted during the follow-up period.CONCLUSION:Surgical techniques using sutured scleral fixation of existing subluxated or dislocated acrylic one-piece IOLs result in favorable visual and refractive outcomes without major complications.展开更多
Objective: To analyze the clinical manifestations of intraocular lens (IOL) opacity after cataract surgery through case reports, and to explore its pathogenesis and diagnosis and treatment ideas, so as to provide a ba...Objective: To analyze the clinical manifestations of intraocular lens (IOL) opacity after cataract surgery through case reports, and to explore its pathogenesis and diagnosis and treatment ideas, so as to provide a basis for the early diagnosis and correct treatment of IOL opacity. Methods: The clinical data of one patient diagnosed with IOL opacity and underwent intraocular lens replacement in the Department of Ophthalmology, Affiliated Hospital of Youjiang Medical College for Nationalities in December 2023 were reported. The characteristics of IOL opacity were observed, and the research progress and pathogenesis of IOL opacity were understood by consulting the literature. Results: This patient is the first case of IOL opacity in our hospital. The specific reason is unclear. It is considered to be related to the IOL material. Conclusion: Hydrophilic acrylic IOL is widely used in clinic because of its good histocompatibility. However, due to its hydrophilicity, there are more cases of IOL opacity than other types of IOL. At present, there is no unified conclusion on the etiology and mechanism of IOL opacity. IOL opacity can seriously affect vision and is easily misdiagnosed as a posterior cataract. We should fully disperse the large pupil and carefully observe under the slit lamp. The most effective treatment for this disease is IOL replacement.展开更多
AIM:To assess visual outcomes and satisfaction of a non-diffractive extended depth of focus(EDOF)intraocular lens(IOL)in individuals with ocular hypertension(OHT)and well-controlled mild glaucoma undergoing cataract s...AIM:To assess visual outcomes and satisfaction of a non-diffractive extended depth of focus(EDOF)intraocular lens(IOL)in individuals with ocular hypertension(OHT)and well-controlled mild glaucoma undergoing cataract surgery.METHODS:An investigator-initiated,single-center,prospective,interventional,noncomparative study conducted in Montreal,Canada.The study enrolled 31 patients(55 eyes)with OHT or mild glaucoma who received a non-diffractive EDOF IOL(Acrysof IQ Vivity).Participants underwent sequential cataract surgery with the Vivity IOL.Follow-up evaluations occurred at 1d,1,and 3mo postoperatively,assessing uncorrected distance,intermediate,and near visual acuity.Questionnaires(QUVID:Questionnaire for visual disturbances and IOLSAT:Intraocular lens satisfaction)were administered pre and post-operatively to measure visual disturbances and spectacle independence in various lighting.Safety parameters included intraocular pressure(IOP),glaucoma medications,spherical equivalence,mean deviation and pattern standard deviation or square root of lost variance on Octopus visual field.RESULTS:At 1 and 3mo postoperatively,significant improvements were observed in uncorrected distance and intermediate visual acuity.Spectacle independence was enhanced for distance and intermediate vision,especially in bright light settings.Spectacle-free intermediate vision was improved even in dim lighting.Visual disturbances,particularly glare symptoms,were reduced,and there was a notable decrease in IOP and glaucoma medication burden at 3mo.There was more hazy vision postoperatively with no impact on visual acuity and visual satisfaction.CONCLUSION:The non-diffractive EDOF lens improves distance and intermediate spectacle-free visual function in patients with OHT and well-controlled glaucoma.The findings highlight significant improvements in visual acuity,reduced glare,enhanced spectacle independence,and improved visual performance in different lighting conditions.展开更多
Multispectral imaging plays a crucial role in simultaneously capturing detailed spatial and spectral information,which is fundamental for understanding complex phenomena across various domains.Traditional systems face...Multispectral imaging plays a crucial role in simultaneously capturing detailed spatial and spectral information,which is fundamental for understanding complex phenomena across various domains.Traditional systems face significant challenges,such as large volume,static function,and limited wavelength selectivity.Here,we propose an innovative dynamic reflective multispectral imaging system via a thermally responsive cholesteric liquid crystal based planar lens.By employing advanced photoalignment technology,the phase distribution of a lens is imprinted to the liquid crystal director.The reflection band is reversibly tuned from 450 nm to 750 nm by thermally controlling the helical pitch of the cholesteric liquid crystal,allowing selectively capturing images in different colors.This capability increases imaging versatility,showing great potential in precision agriculture for assessing crop health,noninvasive diagnostics in healthcare,and advanced remote sensing for environmental monitoring.展开更多
AIM:To investigate the effect of pharmacological pupil alterations on intraocular lens(IOL)power calculations.METHODS:A systematic review and Meta-analysis of studies published before December 2023 in the PubMed,Embas...AIM:To investigate the effect of pharmacological pupil alterations on intraocular lens(IOL)power calculations.METHODS:A systematic review and Meta-analysis of studies published before December 2023 in the PubMed,Embase,and Cochrane library databases on the accuracy of pharmacological pupil changes on IOL power calculation was performed.The primary outcome was the results of IOL power calculations before and after the use of medications.Subgroup analyses were performed based on participants’basic characteristics,such as age,axial length(AL),and whether miosis or mydriasis were used as classification criteria for further analyses.Each eligible study was evaluated for potential risk of bias by the AHRQ assessment scale.The study was registered on PROSPERO(CRD 42024497535).RESULTS:A total of 3062 eyes from 21 studies were eligible.There was no significant difference in the IOL power calculation before and after pharmacological pupil changes using any of the Hoffer Q(WMD=0.055,95%CI=-0.046–0.156;P=0.29),SRK/T(WMD=0.003,95%CI=-0.073–0.080;P=0.93),Haigis(WMD=-0.030,95%CI=-0.176–0.116;P=0.69),Holladay 2(WMD=-0.042,95%CI=-0.366–0.282;P=0.80),and Barrett Universal Ⅱ(WMD=0.033,95%CI=-0.061–0.127;P=0.49)formulas.On the measurement of parameters related to IOL power calculation,for either miosis or mydriasis AL(P=0.98 and 0.29,respectively),lens thickness(P=0.96 and 0.13,respectively),and mean keratometry(P=0.90 and 0.86,respectively)did not present significant differences,while anterior chamber depth(P=0.07 and<0.01,respectively)and white-to-white distance(P=0.01 and 0.04,respectively)changed significantly between the two measurements prior and posterior.At the same time,despite there being some participants with the difference between the before and after calculations greater than 0.5 diopter,there was no significant difference in the incidence rate between these formulas.CONCLUSION:There is no significant effect of pharmacological pupil changes on the IOL power calculation.It will considerably reduce the visit time burden for patients who require cataract surgery.展开更多
AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 ...AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 patients with 132 eyes was conducted from 2020 to 2023.All patients underwent implantation of EVO-V4C ICLs.ICLs were selected based on STAAR’s recommended formula.Postoperative vault values were measured using anterior segment optical coherence tomography(ASOCT).First,feature selection was performed on patients’preoperative examination parameters to identify those most closely related to postoperative vault and incorporate them into the machine learning model.Subsequently,four regression models,namely MLP,XGBoost,RFR,and KNN,were employed to predict the vault,and their predictive performances were compared.The ICL size was set as the prediction target,with the vault and other input features serving as new inputs for predicting the ICL size.RESULTS:Among all preoperative parameters,16 parameters were most closely related to postoperative vault and were included in the prediction model.In vault prediction,XGBoost performed the best in the regression model(R^(2)=0.9999),followed by MLP(R^(2)=0.9987)and RFR(R^(2)=0.8982),while the KNN model had the lowest predictive performance(R^(2)=0.3852).XGBoost achieved a prediction accuracy of 99.8%,MLP had a prediction accuracy of 98.9%,while RFR and KNN had accuracies of 87.1%and 57.4%,respectively.CONCLUSION:AI effectively predicts postoperative vault and determines ICL size.XGBoost outperforms other machine-learning algorithms tested.Its accurate predictions help ophthalmologists choose the right ICL size,ensuring proper vaulting.展开更多
Ultrabright femtosecond X-ray pulses generated by X-ray free-electron lasers(XFELs)enable the high-resolution determination of nanoparticle structures without crystallization or freezing.As each particle that interact...Ultrabright femtosecond X-ray pulses generated by X-ray free-electron lasers(XFELs)enable the high-resolution determination of nanoparticle structures without crystallization or freezing.As each particle that interacts with the pulse is destroyed,an aerodynamic lens(ADL)is used to update the particles by focusing them into a narrow beam in real time.Current single-particle imaging(SPI)experiments are limited by an insufficient number of diffraction patterns;therefore,optimized ADLs are required to improve the hit rate and signal-to-noise ratio,particularly for small particles.Herein,an efficient and simple method for designing ADLs and a new ADL specifically designed for SPI using this method are presented.A new method is proposed based on the functional relationship between a key parameter and its influencing parameters in the ADL,which is established through theoretical analysis and numerical simulations.A detailed design process for the new ADL is also introduced.Both simulations and experiments are performed to characterize the behavior of the particles in the ADL.The results show that particles with diameters ranging from 30 to 500 nm can be effectively focused into a narrow beam.In particular,particles smaller than 100 nm exhibit better performance at lower flow rates than the injector currently used in SPI.The new ADL increases the beam density and reduces the gas background noise.This new method facilitates the design of ADLs for SPI and has potential applications in other fields that utilize focused aerosol beams.展开更多
AIM:To compare the accuracy of manual marking versus an image-guided system for toric implantable collamer lens(TICL)implantation and evaluate the short-term postoperative rotational stability of TICL and corneal surg...AIM:To compare the accuracy of manual marking versus an image-guided system for toric implantable collamer lens(TICL)implantation and evaluate the short-term postoperative rotational stability of TICL and corneal surgically induced astigmatism vector(SIA).METHODS:Retrospective analysis was conducted on eyes with TICL alignment achieved through manual marking(n=75)or VERION image-guided system-assisted marking(n=83).Each group was further classified into horizontal and vertical subgroups based on implant orientation.Additionally,patients were categorized into superior and temporal incision subgroups according to the position of main corneal incision.The misalignment and rotational stability of TICL were analyzed using slit-lamp anterior segment photography.Surgical predictability,efficacy,safety,and corneal SIA were also evaluated.RESULTS:In general,the TICL implantation with manual and digital image-guided systems all achieved robust predictability,efficacy,and safety.The misalignment of TICL was comparable between the manual and VERION groups(0.16°±3.97°vs 0.52°±5.59°,P=0.633),while a significant difference was observed in the absolute misalignment of TICL between the two groups(3.02°±2.55°vs 4.28°±3.61°,P=0.043).There were no significant differences in the distribution of TICL misalignment between the manual and VERION groups or between horizontal and vertical implant orientation groups(P>0.05).Furthermore,different orientations of TICL placement did not show statistically significant differences in rotational stability(P=0.46).Statistically significant differences were found in anterior corneal SIA between the manual and VERION groups(0.46±0.27 vs 0.33±0.21 D,P=0.001),especially for superior incision position(0.60±0.27 vs 0.35±0.23 D,P<0.0001).The anterior SIA exhibited a significant difference between superior and temporal incisions in the manual group(0.60±0.27 vs 0.35±0.20 D,P<0.0001).CONCLUSION:Compared with the conventional manual marking method,this study indicates that the digital image-guided system with VERION is safe and effective in TICL implantation.The digital system offers the advantage of minimizing corneal SIA compared to the manual method.展开更多
Concentrated solar thermal power generation has been experimentally tested in advanced countries for a period of time.This paper demonstrates how this technology can be improved by using water molecules as a medium to...Concentrated solar thermal power generation has been experimentally tested in advanced countries for a period of time.This paper demonstrates how this technology can be improved by using water molecules as a medium to drive traditional generator sets for energy conversion,thereby simultaneously improving the energy conversion rate.Additionally,a novel contribution is made by incorporating a magic number 4 to enhance the focusing efficiency of Fresnel lenses,which drives improvements in power generation output and QE(Quantum Efficiency).展开更多
Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optic...Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.展开更多
AIM:To compare the 12-month outcomes of visual performance and patient satisfaction of a higherorder aspheric monofocal intraocular lens(IOL)and a conventional monofocal IOL.METHODS:Prospective,randomized,comparative,...AIM:To compare the 12-month outcomes of visual performance and patient satisfaction of a higherorder aspheric monofocal intraocular lens(IOL)and a conventional monofocal IOL.METHODS:Prospective,randomized,comparative,double-blinded study including 22 patients who underwent bilateral cataract surgery with implantation of the Tecnis Eyhance ICB00 IOL in one eye(ICB00 group)and the Tecnis ZCB00 IOL in the fellow eye(ZCB00 group).Uncorrected distance(UDVA),corrected distance(CDVA),uncorrected intermediate(UIVA),distance-corrected intermediate(DCIVA),uncorrected near(UNVA),and distance-corrected near visual acuities(DCNVA)were evaluated during a 12-month follow-up.Contrast sensitivity,defocus curves,and reading text size were also evaluated.Patient satisfaction was assessed with a questionnaire at the 6-month postoperative visit.RESULTS:Mean postoperative logMAR UDVA was 0.01±0.12 and-0.02±0.10 in ICB00 and ZCB00 groups,respectively(P=0.37).Mean logMAR UIVA was 0.32±0.19 and 0.45±0.16 in ICB00 and ZCB00 groups,respectively(P=0.010).Differences between groups in UNVA did not reach statistical significance(P=0.16).The intermediate reading acuity at 66 cm(P=0.02)and 80 cm(P=0.04)was significantly better in the ICB00 group.Postoperative contrast sensitivity results did not differ significantly between groups(P>0.05).Patients reported high overall satisfaction,with 62%of patients using spectacles for reading in everyday life.CONCLUSION:The eyes of patients implanted with the enhanced monofocal IOL evaluated have significantly better visual acuity for intermediate distances with the same contrast sensitivity as a conventional monofocal IOL.展开更多
AIM:To investigate the influence of postoperative intraocular lens(IOL)positions on the accuracy of cataract surgery and examine the predictive factors of postoperative biometry prediction errors using the Barrett Uni...AIM:To investigate the influence of postoperative intraocular lens(IOL)positions on the accuracy of cataract surgery and examine the predictive factors of postoperative biometry prediction errors using the Barrett Universal II(BUII)IOL formula for calculation.METHODS:The prospective study included patients who had undergone cataract surgery performed by a single surgeon from June 2020 to April 2022.The collected data included the best-corrected visual acuity(BCVA),corneal curvature,preoperative and postoperative central anterior chamber depths(ACD),axial length(AXL),IOL power,and refractive error.BUII formula was used to calculate the IOL power.The mean absolute error(MAE)was calculated,and all the participants were divided into two groups accordingly.Independent t-tests were applied to compare the variables between groups.Logistic regression analysis was used to analyze the influence of age,AXL,corneal curvature,and preoperative and postoperative ACD on MAE.RESULTS:A total of 261 patients were enrolled.The 243(93.1%)and 18(6.9%)had postoperative MAE<1 and>1 D,respectively.The number of females was higher in patients with MAE>1 D(χ^(2)=3.833,P=0.039).The postoperative BCVA(logMAR)of patients with MAE>1 D was significantly worse(t=-2.448;P=0.025).After adjusting for gender in the logistic model,the risk of postoperative refractive errors was higher in patients with a shallow postoperative anterior chamber[odds ratio=0.346;95% confidence interval(CI):0.164,0.730,P=0.005].CONCLUSION:Risk factors for biometry prediction error after cataract surgery include the patient’s sex and postoperative ACD.Patients with a shallow postoperative anterior chamber are prone to have refractive errors.展开更多
AIM:To assess the refractive and functional outcomes of a novel trifocal intraocular lens(IOL)with smooth micro phase technology.METHODS:This prospective,single-arm,single-center,observational study included patients ...AIM:To assess the refractive and functional outcomes of a novel trifocal intraocular lens(IOL)with smooth micro phase technology.METHODS:This prospective,single-arm,single-center,observational study included patients who underwent cataract surgery with the implantation of the AT ELANA 841P(Carl Zeiss Meditec,Berlin,Germany)IOL.Visual acuity(VA)at distance,intermediate,and near were evaluated 1-and 3-month postop as well as refractive outcomes.Monocular and binocular defocus curve,binocular contrast sensitivity(M&S^(■)Technologies)and patient satisfaction with the Catquest-9SF questionnaire were measured at 3-month postop.RESULTS:In total,46 eyes(23 patients)were bilaterally implanted with the IOL.Mean patient age was 59.86±5.55y.At 1-month postop,monocular corrected VA for distance,intermediate,and near were-0.15±0.09,0.11±0.10,and 0.15±0.12 logMAR,respectively.These outcomes remained stable at the 3-month follow-up(P>0.05).Spherical equivalent(SE)at 1-and 3-month postop remained stable(P>0.05).Following surgery,91%of the eyes at 1mo and 95%of the eyes at 3mo were within±0.5 D of SE.Monocular defocus curve showed that the lens can be categorized as a steep transition IOL.The contrast sensitivity function revealed high values at low spatial frequencies and decreased values at high spatial frequencies.The results of the Catquest-9SF questionnaire showed that all patients were fairly or very satisfied with their vision after surgery.CONCLUSION:The AT ELANA 841P IOL offers excellent visual outcomes across distance,intermediate,and near ranges,along with satisfactory contrast sensitivity.Additionally,the lens is associated with high patient satisfaction and minimal visual difficulties during daily activities.展开更多
The estimation of orientation parameters and correction of lens distortion are crucial problems in the field of Unmanned Aerial Vehicles(UAVs)photogrammetry.In recent years,the utilization of UAVs for aerial photogram...The estimation of orientation parameters and correction of lens distortion are crucial problems in the field of Unmanned Aerial Vehicles(UAVs)photogrammetry.In recent years,the utilization of UAVs for aerial photogrammetry has witnessed a surge in popularity.Typically,UAVs are equipped with low-cost non-metric cameras and a Position and Orientation System(POS).Unfortunately,the Interior Orientation Parameters(IOPs)of the non-metric cameras are not fixed.Whether the lens distortions are large or small,they effect the image coordinates accordingly.Additionally,Inertial Measurement Units(IMUs)often have observation errors.To address these challenges and improve parameter estimation for UAVs Light Detection and Ranging(LiDAR)and photogrammetry,this paper analyzes the accuracy of POS observations obtained from Global Navigation Satellite System Real Time Kinematic(GNSS-RTK)and IMU data.A method that incorporates additional known conditions for parameter estimation,a series of algorithms to simultaneously solve for IOPs,Exterior Orientation Parameters(EOPs),and camera lens distortion correction parameters are proposed.Extensive experiments demonstrate that the coordinates measured by GNSS-RTK can be directly used as linear EOPs;however,angular EOP measurements from IMUs exhibit relatively large errors compared to adjustment results and require correction during the adjustment process.The IOPs of non-metric cameras vary slightly between images but need to be treated as unknown parameters in high precision applications.Furthermore,it is found that the Ebner systematic error model is sensitive to the choice of the magnification parameter of the photographic baseline length in images,it should be set as less than or equal to one third of the photographic baseline to ensure stable solutions.展开更多
文摘As cataract surgery progresses from “restoration of sight” to “refractive correction”, precise prediction of intraocular lens (IOL) power is critical for enhancing postoperative visual quality in patients. IOL power calculation methods have evolved and innovated throughout time, from early theoretical and regression formulas to nonlinear formulas for estimating effective lens position (ELP), multivariable formulas, and innovative formulas that use optical principles and AI-based online formulas. This paper thoroughly discusses the development and iteration of traditional IOL calculation formulas, the emergence of new IOL calculation formulas, and the selection of IOL calculation formulas for different patients in the era of refractive cataract surgery, serving as a reference for “personalized” IOL implantation in clinical practice.
文摘AIM:To assess whether the implantation of a posterior chamber phakic intraocular lens produces changes in optical coherence tomography(OCT)measurements of macular thickness(MT)and two parameters that define the structure of the optic nerve,the peripapillary nerve fiber layer(RNFL)and the Bruch’s membrane opening-minimum rim width(BMO-MRW).METHODS:This nonrandomized prospective pre-post study included 86 eyes of 48 patients(age,20-47y;axial length:23.10-28.95 mm)scheduled for myopia or myopic astigmatism correction with implantation of the implantable collamer lens(ICL).Eyes with glaucoma or any other ocular disease that could alter OCT results were excluded.RNFL,BMO-MRW and MT were measured preoperatively,and at 1 and 6mo after surgery using spectral-domain OCT.Changes between preoperative and postoperative values were evaluated.RESULTS:There was a significant increase in BMOMRW at 1mo(mean change:3.48±15.07μm,P=0.041).No significant changes were found during the rest of followup(1-6mo postop.,P=0.623).There was also a significant increase in RNFL thickness at 1mo af ter surger y(1.45±2.18μm,P<0.001),but with a significant reduction from 1 to 6mo postoperatively(P=0.002).Regarding MT,it increased significantly at 1mo(2.46±3.76μm,P<0.001),with a significant decrease afterwards(P=0.048).Measurements of the three parameters at 6mo were slightly superior to preoperative values(P<0.01).CONCLUSION:Minimal changes are induced in BMOMRW,RNFL and MT after ICL implantation in healthy eyes,confirming the safety of the surgical procedure regarding the structure of the optic nerve head and the macula,and indicating that this phakic intraocular lens seems to have a slight impact on OCT measurements.
基金supported by the National Natural Science Foundation of China(82371089).
文摘Objective:To evaluate the performance of orthokeratology(ortho-k)lens reordering using software-designed system,so as to determine the feasibility of ortho-k lens reordering without discontinuing lens wear.Methods:This study is a retrospective analysis of data of ortho-k lens wearers who had a history of short-term discontinuation of lens wear.A total of 94 individuals aged over 8 years with spherical equivalent refraction ranging from-0.50 to-6.50 diopters were included.The corneal topography data at baseline(before ortho-k)and after lens wear discontinuation(cessation of ortho-k treatment)were imported separately into the lens-design software,along with corresponding refraction data.Subsequently,corneal and lens parameters were generated and compared.Intraclass correlation coefficients(ICC)were calculated,and Bland and Altman analyses were conducted.Results:All 94 children were involved in the retrospective analysis.Compared with baseline data,there was a high level of consistency between Rwo(without discontinuation)and Rwith(with discontinuation),with an ICC of 0.96(P<0.001).Furthermore,the comparison of lens parameters generated by the Easyfit software between baseline and after short-term discontinuation showed a high degree of consistency,with all of the ICC values exceeding 0.90.Similar results were obtained using the WAVE software,as both ICC values and Bland-Altman plots demonstrated a high level of consistency in lens parameters between two conditions(nearly all data points fell within the 95%LoAs).Conclusions:It is feasible to directly reorder new ortho-k lenses using software fitting approaches.However,further investigations are necessary to validate their practicability in a clinical setting.
基金Supported by the National Key Research and Development Program(No.2019YFC1710200)the Shandong Province Pharmaceutical Technology Development Project(No.202107020970).
文摘Dear Editor,The latest Visian implantable collamer lens(ICL)with a central port design(Aquaport;model V4c)obviates the necessity for preoperative laser iridotomy or intraoperative iridectomy by allowing the free flow of the aqueous humor between the sides of the intraocular lens.The design of Aquaport can also eliminate the complications associated with iridotomy and iridectomy.Therefore,the V4c ICL has the potential to significantly reduce the risk of pupillary block compared to its predecessors.
文摘AIM:To compare the clinical outcomes of extended depth-of-focus intraocular lenses(EDOF IOLs)using either micromonovision implantation or mixed implantation of EDOF and diffractive bifocal IOLs.METHODS:This retrospective clinical trial included 130 patients(260 eyes),who were divided into two groups.Group RR comprised 70 patients(140 eyes)bilaterally implanted with ZXR00 IOLs(Tecnis ZXR00,where one target was-0.5 D to-0.75 D and the other was 0 to-0.25 D).Group RM comprised 60 patients(120 eyes)unilaterally implanted with both ZXR00 and ZMB00 IOLs(Tecnis ZMB00,0 to-0.25 D).Postoperative outcomes were compared after 3 mo,including visual acuity,defocus curves,stereoacuity,modulation transfer functions(MTFs),higher-order aberrations,and Visual Function-14(VF-14)questionnaire responses.RESULTS:Group RR had superior bilateral intermediate vision,while the group RM had superior bilateral near vision(both P<0.05).Group RM also exhibited superior MTFs and reduced higher-order aberrations(both P<0.05).Stereoacuity and VF-14 questionnaire results showed no statistically significant difference between groups(P>0.05).CONCLUSION:The implantation of micromonovision has significantly improved near vision.IOLs and their collocation can be customized according to individual patient needs to achieve precise treatment and provide cataract patients with high-quality vision.
文摘AIM:To evaluate the visual and refractive outcomes in cases after sutured scleral fixation of existing subluxated or dislocated acrylic one-piece intraocular lenses(IOLs).METHODS:This study retrospectively enrolled a consecutive series of patients who underwent a surgery of sutured existing subluxated or dislocated IOLs from October 2018 to June 2020.All patients underwent comprehensive preoperative and postoperative ophthalmologic examination,and data were collected including age,sex,surgical indications,best-corrected visual acuity,refractive error,intraocular pressure.Presence of intraoperative and postoperative surgical complications was documented.RESULTS:A total of 20 consecutive cases were enrolled for analysis with mean final follow-up period 9.8±5.3mo.Visual acuity improved from a mean of 0.35(0.46±0.32 logMAR)preoperatively to 0.61(0.21±0.18 logMAR)at the 3-month follow-up(P=0.002).The mean amount of preoperative keratometric astigmatism and total postoperative refractive astigmatism was-1.24±0.80 diopters(D)and-1.42±0.97 D,respectively.There was no statistically significant difference between preoperative and postoperative astigmatism(P=0.156).The mean IOL-induced astigmatism was-0.23±0.53 D.The mean spherical equivalent at the 3-month follow-up was-0.1±0.94 D.No major complications were noted during the follow-up period.CONCLUSION:Surgical techniques using sutured scleral fixation of existing subluxated or dislocated acrylic one-piece IOLs result in favorable visual and refractive outcomes without major complications.
文摘Objective: To analyze the clinical manifestations of intraocular lens (IOL) opacity after cataract surgery through case reports, and to explore its pathogenesis and diagnosis and treatment ideas, so as to provide a basis for the early diagnosis and correct treatment of IOL opacity. Methods: The clinical data of one patient diagnosed with IOL opacity and underwent intraocular lens replacement in the Department of Ophthalmology, Affiliated Hospital of Youjiang Medical College for Nationalities in December 2023 were reported. The characteristics of IOL opacity were observed, and the research progress and pathogenesis of IOL opacity were understood by consulting the literature. Results: This patient is the first case of IOL opacity in our hospital. The specific reason is unclear. It is considered to be related to the IOL material. Conclusion: Hydrophilic acrylic IOL is widely used in clinic because of its good histocompatibility. However, due to its hydrophilicity, there are more cases of IOL opacity than other types of IOL. At present, there is no unified conclusion on the etiology and mechanism of IOL opacity. IOL opacity can seriously affect vision and is easily misdiagnosed as a posterior cataract. We should fully disperse the large pupil and carefully observe under the slit lamp. The most effective treatment for this disease is IOL replacement.
文摘AIM:To assess visual outcomes and satisfaction of a non-diffractive extended depth of focus(EDOF)intraocular lens(IOL)in individuals with ocular hypertension(OHT)and well-controlled mild glaucoma undergoing cataract surgery.METHODS:An investigator-initiated,single-center,prospective,interventional,noncomparative study conducted in Montreal,Canada.The study enrolled 31 patients(55 eyes)with OHT or mild glaucoma who received a non-diffractive EDOF IOL(Acrysof IQ Vivity).Participants underwent sequential cataract surgery with the Vivity IOL.Follow-up evaluations occurred at 1d,1,and 3mo postoperatively,assessing uncorrected distance,intermediate,and near visual acuity.Questionnaires(QUVID:Questionnaire for visual disturbances and IOLSAT:Intraocular lens satisfaction)were administered pre and post-operatively to measure visual disturbances and spectacle independence in various lighting.Safety parameters included intraocular pressure(IOP),glaucoma medications,spherical equivalence,mean deviation and pattern standard deviation or square root of lost variance on Octopus visual field.RESULTS:At 1 and 3mo postoperatively,significant improvements were observed in uncorrected distance and intermediate visual acuity.Spectacle independence was enhanced for distance and intermediate vision,especially in bright light settings.Spectacle-free intermediate vision was improved even in dim lighting.Visual disturbances,particularly glare symptoms,were reduced,and there was a notable decrease in IOP and glaucoma medication burden at 3mo.There was more hazy vision postoperatively with no impact on visual acuity and visual satisfaction.CONCLUSION:The non-diffractive EDOF lens improves distance and intermediate spectacle-free visual function in patients with OHT and well-controlled glaucoma.The findings highlight significant improvements in visual acuity,reduced glare,enhanced spectacle independence,and improved visual performance in different lighting conditions.
基金supported by the National Key Research and Development Program of China(No.2022YFA1203700)the National Natural Science Foundation of China(NSFC)(Nos.62405129 and 62035008)+1 种基金the University Research Project of Guangzhou Education Bureau(No.202235053)the Natural Science Foundation of Jiangsu Province(No.BK20241197).
文摘Multispectral imaging plays a crucial role in simultaneously capturing detailed spatial and spectral information,which is fundamental for understanding complex phenomena across various domains.Traditional systems face significant challenges,such as large volume,static function,and limited wavelength selectivity.Here,we propose an innovative dynamic reflective multispectral imaging system via a thermally responsive cholesteric liquid crystal based planar lens.By employing advanced photoalignment technology,the phase distribution of a lens is imprinted to the liquid crystal director.The reflection band is reversibly tuned from 450 nm to 750 nm by thermally controlling the helical pitch of the cholesteric liquid crystal,allowing selectively capturing images in different colors.This capability increases imaging versatility,showing great potential in precision agriculture for assessing crop health,noninvasive diagnostics in healthcare,and advanced remote sensing for environmental monitoring.
基金Supported by Beijing Natural Science Foundation from Beijing Municipal Government(No.7202030).
文摘AIM:To investigate the effect of pharmacological pupil alterations on intraocular lens(IOL)power calculations.METHODS:A systematic review and Meta-analysis of studies published before December 2023 in the PubMed,Embase,and Cochrane library databases on the accuracy of pharmacological pupil changes on IOL power calculation was performed.The primary outcome was the results of IOL power calculations before and after the use of medications.Subgroup analyses were performed based on participants’basic characteristics,such as age,axial length(AL),and whether miosis or mydriasis were used as classification criteria for further analyses.Each eligible study was evaluated for potential risk of bias by the AHRQ assessment scale.The study was registered on PROSPERO(CRD 42024497535).RESULTS:A total of 3062 eyes from 21 studies were eligible.There was no significant difference in the IOL power calculation before and after pharmacological pupil changes using any of the Hoffer Q(WMD=0.055,95%CI=-0.046–0.156;P=0.29),SRK/T(WMD=0.003,95%CI=-0.073–0.080;P=0.93),Haigis(WMD=-0.030,95%CI=-0.176–0.116;P=0.69),Holladay 2(WMD=-0.042,95%CI=-0.366–0.282;P=0.80),and Barrett Universal Ⅱ(WMD=0.033,95%CI=-0.061–0.127;P=0.49)formulas.On the measurement of parameters related to IOL power calculation,for either miosis or mydriasis AL(P=0.98 and 0.29,respectively),lens thickness(P=0.96 and 0.13,respectively),and mean keratometry(P=0.90 and 0.86,respectively)did not present significant differences,while anterior chamber depth(P=0.07 and<0.01,respectively)and white-to-white distance(P=0.01 and 0.04,respectively)changed significantly between the two measurements prior and posterior.At the same time,despite there being some participants with the difference between the before and after calculations greater than 0.5 diopter,there was no significant difference in the incidence rate between these formulas.CONCLUSION:There is no significant effect of pharmacological pupil changes on the IOL power calculation.It will considerably reduce the visit time burden for patients who require cataract surgery.
基金Supported by the National Natural Science Foundation of China(No.82271100)the Jiangsu Science and Technology Support Program(No.BE2022805)the Clinical Skills Enhancement Program of Jiangsu Province Hospital(No.JSPH-MC-2022-24).
文摘AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 patients with 132 eyes was conducted from 2020 to 2023.All patients underwent implantation of EVO-V4C ICLs.ICLs were selected based on STAAR’s recommended formula.Postoperative vault values were measured using anterior segment optical coherence tomography(ASOCT).First,feature selection was performed on patients’preoperative examination parameters to identify those most closely related to postoperative vault and incorporate them into the machine learning model.Subsequently,four regression models,namely MLP,XGBoost,RFR,and KNN,were employed to predict the vault,and their predictive performances were compared.The ICL size was set as the prediction target,with the vault and other input features serving as new inputs for predicting the ICL size.RESULTS:Among all preoperative parameters,16 parameters were most closely related to postoperative vault and were included in the prediction model.In vault prediction,XGBoost performed the best in the regression model(R^(2)=0.9999),followed by MLP(R^(2)=0.9987)and RFR(R^(2)=0.8982),while the KNN model had the lowest predictive performance(R^(2)=0.3852).XGBoost achieved a prediction accuracy of 99.8%,MLP had a prediction accuracy of 98.9%,while RFR and KNN had accuracies of 87.1%and 57.4%,respectively.CONCLUSION:AI effectively predicts postoperative vault and determines ICL size.XGBoost outperforms other machine-learning algorithms tested.Its accurate predictions help ophthalmologists choose the right ICL size,ensuring proper vaulting.
基金supported by the Major State Basic Research Development Program of China(No.2022YFA1603703)Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB 37040303)+1 种基金National Natural Science Foundation of China(No.12335020)Shanghai Soft X-ray Free Electron Laser Facility beamline project.
文摘Ultrabright femtosecond X-ray pulses generated by X-ray free-electron lasers(XFELs)enable the high-resolution determination of nanoparticle structures without crystallization or freezing.As each particle that interacts with the pulse is destroyed,an aerodynamic lens(ADL)is used to update the particles by focusing them into a narrow beam in real time.Current single-particle imaging(SPI)experiments are limited by an insufficient number of diffraction patterns;therefore,optimized ADLs are required to improve the hit rate and signal-to-noise ratio,particularly for small particles.Herein,an efficient and simple method for designing ADLs and a new ADL specifically designed for SPI using this method are presented.A new method is proposed based on the functional relationship between a key parameter and its influencing parameters in the ADL,which is established through theoretical analysis and numerical simulations.A detailed design process for the new ADL is also introduced.Both simulations and experiments are performed to characterize the behavior of the particles in the ADL.The results show that particles with diameters ranging from 30 to 500 nm can be effectively focused into a narrow beam.In particular,particles smaller than 100 nm exhibit better performance at lower flow rates than the injector currently used in SPI.The new ADL increases the beam density and reduces the gas background noise.This new method facilitates the design of ADLs for SPI and has potential applications in other fields that utilize focused aerosol beams.
文摘AIM:To compare the accuracy of manual marking versus an image-guided system for toric implantable collamer lens(TICL)implantation and evaluate the short-term postoperative rotational stability of TICL and corneal surgically induced astigmatism vector(SIA).METHODS:Retrospective analysis was conducted on eyes with TICL alignment achieved through manual marking(n=75)or VERION image-guided system-assisted marking(n=83).Each group was further classified into horizontal and vertical subgroups based on implant orientation.Additionally,patients were categorized into superior and temporal incision subgroups according to the position of main corneal incision.The misalignment and rotational stability of TICL were analyzed using slit-lamp anterior segment photography.Surgical predictability,efficacy,safety,and corneal SIA were also evaluated.RESULTS:In general,the TICL implantation with manual and digital image-guided systems all achieved robust predictability,efficacy,and safety.The misalignment of TICL was comparable between the manual and VERION groups(0.16°±3.97°vs 0.52°±5.59°,P=0.633),while a significant difference was observed in the absolute misalignment of TICL between the two groups(3.02°±2.55°vs 4.28°±3.61°,P=0.043).There were no significant differences in the distribution of TICL misalignment between the manual and VERION groups or between horizontal and vertical implant orientation groups(P>0.05).Furthermore,different orientations of TICL placement did not show statistically significant differences in rotational stability(P=0.46).Statistically significant differences were found in anterior corneal SIA between the manual and VERION groups(0.46±0.27 vs 0.33±0.21 D,P=0.001),especially for superior incision position(0.60±0.27 vs 0.35±0.23 D,P<0.0001).The anterior SIA exhibited a significant difference between superior and temporal incisions in the manual group(0.60±0.27 vs 0.35±0.20 D,P<0.0001).CONCLUSION:Compared with the conventional manual marking method,this study indicates that the digital image-guided system with VERION is safe and effective in TICL implantation.The digital system offers the advantage of minimizing corneal SIA compared to the manual method.
文摘Concentrated solar thermal power generation has been experimentally tested in advanced countries for a period of time.This paper demonstrates how this technology can be improved by using water molecules as a medium to drive traditional generator sets for energy conversion,thereby simultaneously improving the energy conversion rate.Additionally,a novel contribution is made by incorporating a magic number 4 to enhance the focusing efficiency of Fresnel lenses,which drives improvements in power generation output and QE(Quantum Efficiency).
基金Key Research and Development Projects of Zhejiang Science and Technology Plan(No.2021C03103)Research and Development Plan of Zhejiang Science and Technology Department(No.2023C03089)Scientific Research Project of Zhejiang Provincial Department of Education(No.Y202456401)。
文摘Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.
文摘AIM:To compare the 12-month outcomes of visual performance and patient satisfaction of a higherorder aspheric monofocal intraocular lens(IOL)and a conventional monofocal IOL.METHODS:Prospective,randomized,comparative,double-blinded study including 22 patients who underwent bilateral cataract surgery with implantation of the Tecnis Eyhance ICB00 IOL in one eye(ICB00 group)and the Tecnis ZCB00 IOL in the fellow eye(ZCB00 group).Uncorrected distance(UDVA),corrected distance(CDVA),uncorrected intermediate(UIVA),distance-corrected intermediate(DCIVA),uncorrected near(UNVA),and distance-corrected near visual acuities(DCNVA)were evaluated during a 12-month follow-up.Contrast sensitivity,defocus curves,and reading text size were also evaluated.Patient satisfaction was assessed with a questionnaire at the 6-month postoperative visit.RESULTS:Mean postoperative logMAR UDVA was 0.01±0.12 and-0.02±0.10 in ICB00 and ZCB00 groups,respectively(P=0.37).Mean logMAR UIVA was 0.32±0.19 and 0.45±0.16 in ICB00 and ZCB00 groups,respectively(P=0.010).Differences between groups in UNVA did not reach statistical significance(P=0.16).The intermediate reading acuity at 66 cm(P=0.02)and 80 cm(P=0.04)was significantly better in the ICB00 group.Postoperative contrast sensitivity results did not differ significantly between groups(P>0.05).Patients reported high overall satisfaction,with 62%of patients using spectacles for reading in everyday life.CONCLUSION:The eyes of patients implanted with the enhanced monofocal IOL evaluated have significantly better visual acuity for intermediate distances with the same contrast sensitivity as a conventional monofocal IOL.
基金Supported by the Innovation&Transfer Fund of Peking University Third Hospital(No.BYSYZHKC2021108).
文摘AIM:To investigate the influence of postoperative intraocular lens(IOL)positions on the accuracy of cataract surgery and examine the predictive factors of postoperative biometry prediction errors using the Barrett Universal II(BUII)IOL formula for calculation.METHODS:The prospective study included patients who had undergone cataract surgery performed by a single surgeon from June 2020 to April 2022.The collected data included the best-corrected visual acuity(BCVA),corneal curvature,preoperative and postoperative central anterior chamber depths(ACD),axial length(AXL),IOL power,and refractive error.BUII formula was used to calculate the IOL power.The mean absolute error(MAE)was calculated,and all the participants were divided into two groups accordingly.Independent t-tests were applied to compare the variables between groups.Logistic regression analysis was used to analyze the influence of age,AXL,corneal curvature,and preoperative and postoperative ACD on MAE.RESULTS:A total of 261 patients were enrolled.The 243(93.1%)and 18(6.9%)had postoperative MAE<1 and>1 D,respectively.The number of females was higher in patients with MAE>1 D(χ^(2)=3.833,P=0.039).The postoperative BCVA(logMAR)of patients with MAE>1 D was significantly worse(t=-2.448;P=0.025).After adjusting for gender in the logistic model,the risk of postoperative refractive errors was higher in patients with a shallow postoperative anterior chamber[odds ratio=0.346;95% confidence interval(CI):0.164,0.730,P=0.005].CONCLUSION:Risk factors for biometry prediction error after cataract surgery include the patient’s sex and postoperative ACD.Patients with a shallow postoperative anterior chamber are prone to have refractive errors.
文摘AIM:To assess the refractive and functional outcomes of a novel trifocal intraocular lens(IOL)with smooth micro phase technology.METHODS:This prospective,single-arm,single-center,observational study included patients who underwent cataract surgery with the implantation of the AT ELANA 841P(Carl Zeiss Meditec,Berlin,Germany)IOL.Visual acuity(VA)at distance,intermediate,and near were evaluated 1-and 3-month postop as well as refractive outcomes.Monocular and binocular defocus curve,binocular contrast sensitivity(M&S^(■)Technologies)and patient satisfaction with the Catquest-9SF questionnaire were measured at 3-month postop.RESULTS:In total,46 eyes(23 patients)were bilaterally implanted with the IOL.Mean patient age was 59.86±5.55y.At 1-month postop,monocular corrected VA for distance,intermediate,and near were-0.15±0.09,0.11±0.10,and 0.15±0.12 logMAR,respectively.These outcomes remained stable at the 3-month follow-up(P>0.05).Spherical equivalent(SE)at 1-and 3-month postop remained stable(P>0.05).Following surgery,91%of the eyes at 1mo and 95%of the eyes at 3mo were within±0.5 D of SE.Monocular defocus curve showed that the lens can be categorized as a steep transition IOL.The contrast sensitivity function revealed high values at low spatial frequencies and decreased values at high spatial frequencies.The results of the Catquest-9SF questionnaire showed that all patients were fairly or very satisfied with their vision after surgery.CONCLUSION:The AT ELANA 841P IOL offers excellent visual outcomes across distance,intermediate,and near ranges,along with satisfactory contrast sensitivity.Additionally,the lens is associated with high patient satisfaction and minimal visual difficulties during daily activities.
基金Natural Science Foundation of Hunan Province,China(No.2024JJ8335)Open Topic of Hunan Geospatial Information Engineering and Technology Research Center,China(No.HNGIET2023004).
文摘The estimation of orientation parameters and correction of lens distortion are crucial problems in the field of Unmanned Aerial Vehicles(UAVs)photogrammetry.In recent years,the utilization of UAVs for aerial photogrammetry has witnessed a surge in popularity.Typically,UAVs are equipped with low-cost non-metric cameras and a Position and Orientation System(POS).Unfortunately,the Interior Orientation Parameters(IOPs)of the non-metric cameras are not fixed.Whether the lens distortions are large or small,they effect the image coordinates accordingly.Additionally,Inertial Measurement Units(IMUs)often have observation errors.To address these challenges and improve parameter estimation for UAVs Light Detection and Ranging(LiDAR)and photogrammetry,this paper analyzes the accuracy of POS observations obtained from Global Navigation Satellite System Real Time Kinematic(GNSS-RTK)and IMU data.A method that incorporates additional known conditions for parameter estimation,a series of algorithms to simultaneously solve for IOPs,Exterior Orientation Parameters(EOPs),and camera lens distortion correction parameters are proposed.Extensive experiments demonstrate that the coordinates measured by GNSS-RTK can be directly used as linear EOPs;however,angular EOP measurements from IMUs exhibit relatively large errors compared to adjustment results and require correction during the adjustment process.The IOPs of non-metric cameras vary slightly between images but need to be treated as unknown parameters in high precision applications.Furthermore,it is found that the Ebner systematic error model is sensitive to the choice of the magnification parameter of the photographic baseline length in images,it should be set as less than or equal to one third of the photographic baseline to ensure stable solutions.
