An approximate analytic model is presented to describe spatial structure of refracted electromagnetic field arising at oblique incidence of a Gaussian beam on a plane boundary of an absorbing homogeneous medium. The a...An approximate analytic model is presented to describe spatial structure of refracted electromagnetic field arising at oblique incidence of a Gaussian beam on a plane boundary of an absorbing homogeneous medium. The analytic solution is obtained by asymptotic approximation of a Fourier field integral under the condition of great beam width in comparison with a wavelength (the geometrical-optics approximation). This model can be used also for approximate simulation of refracted field in the cases of beam incidence near the critical angle on transparent or absorbing (amplifying) refracting medium, if one artificially introduces the additional absorption (amplification), whose value is proportional to the ratio of the wavelength and the effective beam width. It is shown that the analytic model reflects the general features of refracted field at total internal reflection.展开更多
Three-component seismic exploration through P-wave source and three-component geophone is an effective technique used in complicated reservoir exploration. In three-component seismic exploration data processing,one of...Three-component seismic exploration through P-wave source and three-component geophone is an effective technique used in complicated reservoir exploration. In three-component seismic exploration data processing,one of the difficulties is static correction of converted wave. This paper analyzes propagation characteristics of non-converted and converted refracted waves,and discovers a favor-able condition for the formation of converted refracted wave,i.e. the velocity of overlaying medium S wave is much lower than that of underlying medium S wave. In addition,the paper proposes the static correction method of converted wave based on PPS converted refracted wave,and processes the real three-component seismic data with better results of static correction of converted wave.展开更多
AIM:To evaluate the efficacy of the total computer vision syndrome questionnaire(CVS-Q)score as a predictive tool for identifying individuals with symptomatic binocular vision anomalies and refractive errors.METHODS:A...AIM:To evaluate the efficacy of the total computer vision syndrome questionnaire(CVS-Q)score as a predictive tool for identifying individuals with symptomatic binocular vision anomalies and refractive errors.METHODS:A total of 141 healthy computer users underwent comprehensive clinical visual function assessments,including evaluations of refractive errors,accommodation(amplitude of accommodation,positive relative accommodation,negative relative accommodation,accommodative accuracy,and accommodative facility),and vergence(phoria,positive and negative fusional vergence,near point of convergence,and vergence facility).Total CVS-Q scores were recorded to explore potential associations between symptom scores and the aforementioned clinical visual function parameters.RESULTS:The cohort included 54 males(38.3%)with a mean age of 23.9±0.58y and 87 age-matched females(61.7%)with a mean age of 23.9±0.53y.The multiple regression model was statistically significant[R²=0.60,F=13.28,degrees of freedom(DF=17122,P<0.001].This indicates that 60%of the variance in total CVS-Q scores(reflecting reported symptoms)could be explained by four clinical measurements:amplitude of accommodation,positive relative accommodation,exophoria at distance and near,and positive fusional vergence at near.CONCLUSION:The total CVS-Q score is a valid and reliable tool for predicting the presence of various nonstrabismic binocular vision anomalies and refractive errors in symptomatic computer users.展开更多
AIM:To ascertain the pattern of ocular morbidity in a population of primary school children in rural Kenya as it is a prerequisite for planning effective preventive and therapeutic strategies.METHODS:A cross-sectional...AIM:To ascertain the pattern of ocular morbidity in a population of primary school children in rural Kenya as it is a prerequisite for planning effective preventive and therapeutic strategies.METHODS:A cross-sectional survey of ocular symptoms and clinical eye examinations were performed in a sample of 35 rural primary schools in the semi-arid region of Kajiado West sub-county in S.W.Kenya,amongst a seminomadic tribe(Maasai).Students in Grades 1-8 were included.Visual acuity was measured using the Snellen“tumbling E”chart at 6 m.Children with symptoms of refractive error underwent non-cycloplegic refraction.RESULTS:A total of 2036 children(1084 males)between the ages of 4-20y were examined.Conjunctival actinic changes were present in 22%(442/2036).Nine cases were seen with a potential squamous carcinoma.No overt classical ocular signs of vitamin A deficiency were noted,although 181(8.9%)children complained of nyctalopia.Three hundred thirty-six(16.5%)children had a visual acuity worse than 6/12 in either eye,were unable to read N10 near text at 40 cm or had symptoms suggestive of refractive error.Refractive data led to an estimate of hyperopia of+1.00 D or more in 3.9%and of myopia of-0.50 D or more in either eye in 3.0%of the study population.CONCLUSION:Solar exposure-and dust-related conjunctival pathology is common.As this may develop into potentially sight-or even life-threatening conditions,it warrants further study,and preventive strategies may be needed.Complaints of nyctalopia were common and could suggest vitamin A deficiency.The prevalence of refractive errors is low in this rural African population.展开更多
Dear Editor,We present this case report which discusses a patient who underwent flap amputation after repeated attempts to resolve persistent and severe epithelial ingrowth following laser-assisted in situ keratomileu...Dear Editor,We present this case report which discusses a patient who underwent flap amputation after repeated attempts to resolve persistent and severe epithelial ingrowth following laser-assisted in situ keratomileusis(LASIK)surgery.Epithelial ingrowth is a known complication of LASIK surgery,typically manageable with minimal measures.However,severe cases may necessitate more aggressive interventions,such as flap amputation[1].LASIK is a widely performed refractive surgery with high success rates and excellent visual outcome[2].展开更多
In this paper,we have calculated the structural,electronic,and optical properties of chalcogenide stannite Cu_(2)CdSnX4(X=S,Se,Te) materials.The calculations are based on the density functional theory (DFT) method and...In this paper,we have calculated the structural,electronic,and optical properties of chalcogenide stannite Cu_(2)CdSnX4(X=S,Se,Te) materials.The calculations are based on the density functional theory (DFT) method and are performed using the Cambridge sequential total energy package (CASTEP) code included in the Biovia Material Studio 20 software.All optical properties have been studied in a domain that extends energetically from 10 meV to 40 eV.Our results show that Cu_(2)CdSnX4(X=S,Se,Te) stannite exhibits absorption in the visible region,the refractive index decreases with increasing energy,and the refractive index values are n=3.2,3.73 and 3.75 for Cu_(2)CdSnS_(4),Cu_(2)CdSnSe_(4)and Cu_(2)CdSnTe_(4),respectively.They show also high conductivity,which implies that this material is promising for solar cells.These results argue in favor of the use of these materials in various potential applications.The density of state,band structures,and structural properties of Cu_(2)CdSnX4(X=S,Se,and Te) stannite are also studied in this work.展开更多
AIM:To evaluate the visual outcomes of implantable collamer lenses(ICLs)and identify the possible risk factors for ICL axis misalignment,and consequently,repositioning,explanting,or exchanging at a specialized eye hos...AIM:To evaluate the visual outcomes of implantable collamer lenses(ICLs)and identify the possible risk factors for ICL axis misalignment,and consequently,repositioning,explanting,or exchanging at a specialized eye hospital in Saudi Arabia.METHODS:The medical records of 813 eyes with different refractive errors corrected with ICL implantation were identified and included in this single-arm retrospective cohort study.The following data were collected:demographic characteristics,primary diagnosis,preoperative refraction,anterior chamber depth(ACD),white-to-white(WTW)measurement,endothelial cell density(ECD),and axial length.Patients’satisfaction and complaints,and their postoperative refraction,vault depth,and axis alignment with the preoperative target,were reviewed during the postoperative period.Collectively,these data were correlated with symptomatic axis rotation and the need for repositioning,explantation,or exchange due to high or low ICL vaults.RESULTS:Of 813 eyes,27(3.32%),13(1.59%),and 11(1.35%)required ICL repositioning,ICL explantation only without exchange,and ICL explantation with the placement of a new ICL,respectively.The mean follow-up period was 37.5mo.The main cause of explanation or exchange was incorrect WTW measurement in seven(29.17%)eyes,followed by high vault in four(16.56%)eyes.ICL repositioning was required in 27(3.32%)eyes with considerable rotation.Only 2(0.24%)eyes developed cataracts that required ICL removal,and retinal complications were reported in 7(0.86%)eyes.Long-term glaucoma and corneal decompensation were not observed in this cohort.CONCLUSION:With a high safety profile and reversibility,ICL implantation is a good alternative to corneal-based refractive surgery in eyes unsuitable for laser vision correction.The rate of secondary procedures in our study was 6.26%.Old age is a risk factor for secondary surgical interventions in the repositioning group,whereas abnormal vault and toric ICL rotation in the explantation group necessitated subsequent surgical procedures.Overall,ICL implantation demonstrates a good efficacy index and safety profile in patients with diverse refractive errors.展开更多
A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refracti...A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refractive index sensing functionality were simulated using the finite element method(FEM).A multi-Fano resonance phenomenon was clearly observable in the transmission spectra.The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the Dshaped resonant cavity and the continuum state of the non-through MIM waveguide.The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments.Additionally,the refractive index sensing properties,based on the Fano resonance,were investigated by varying the refractive index of the MIM waveguide's insulator layer.A maximum sensitivity and FOM of 1155 RIU/nm and 40 were achieved,respectively.This research opens up new possibilities for designing and exploring high-sensitivity photonic devices,micro-sensors,and innovative on-chip sensing architectures for future applications.展开更多
Based on optofluidics and whispering gallery mode(WGM)theory,here an optofluidic refractive index sensor with microtube-coupled suspended core fiber(SCF)is proposed.It solves the issues of general sensors with microca...Based on optofluidics and whispering gallery mode(WGM)theory,here an optofluidic refractive index sensor with microtube-coupled suspended core fiber(SCF)is proposed.It solves the issues of general sensors with microcavity-coupled fiber taper such as too fragile,unstable performance due to open coupling,poor portability and repeatability,while overcoming the poor performance of low refractive index sensing in general full-package fiber sensors.The sensor only needs a very small amount of liquid sample(about 1.8 nL).The proposed sensor combines the excellent performance of full package,optofluidics and WGM resonator.The resonant characteristics and sensing performance of the sensor are analyzed and discussed by the theoretical simulation.The simulation results indicate that the sensor has a wide refractive index sensing range(1.330-1.700)and good performance.The resonance wavelength shift has a good linear relationship with the liquid refractive index variation.In the low refractive index region,the sensitivity is 222.5-247.5 nm/RIU,Q-factor is 1.03×10^(3) and the detection limit is 3.64×10^(-4) RIU.In the medium and high refractive index regions,the sensitivity is 564.4-846.2 nm/RIU,Q-factor is up to 8.62×10^(4),and the detection limit can be as low as 1.29×10^(-6) RIU.The sensor exhibits a high sensitivity,a high Q-factor and a very low detection limit.展开更多
Blindness affected 45 million people globally in 2021,and moderate to severe vision loss a further 295 million.[1]The most common causes,cataract and uncorrected refractive error,are generally the easiest to treat,and...Blindness affected 45 million people globally in 2021,and moderate to severe vision loss a further 295 million.[1]The most common causes,cataract and uncorrected refractive error,are generally the easiest to treat,and are among the most cost-effective procedures in all of medicine and international development.[1-2]Thus,vision impairment is both extremely common and,in principle,readily manageable.展开更多
AIM:To analyze the two-year visual and refractive outcomes as well as the safety,and efficacy of photorefractive keratectomy(PRK)surgery for myopia.METHODS:In this prospective cohort study,63 eligible patients were re...AIM:To analyze the two-year visual and refractive outcomes as well as the safety,and efficacy of photorefractive keratectomy(PRK)surgery for myopia.METHODS:In this prospective cohort study,63 eligible patients were recruited,including 45 women(71.4%)and 18 men(28.6%).Demographic characteristics along with pre-and post-operative clinical data including visual acuity,refraction,maximum ablation,spherical and cylindrical error,and residual stromal bed(RSB)were evaluated.RESULTS:The mean age of the patients was 35.42±8.16y(range 22 to 55y).The mean spherical and cylindrical error before surgery were-2.23±1.58 D(range-5 to+0.25)and-1.24±0.94 D,respectively(range-3.75 to 0.00).The mean efficacy and safety of PRK surgery at 2y follow-up were 0.98±0.06 and 1.01±0.04 respectively.The lower age was significantly correlated with a higher amount of efficacy index(P<0.001,r=-0.42).Also,the lower amount of preoperative myopia and spherical equivalent(SE)were correlated with a higher safety index(P<0.001,r=-0.44;P<0.001,r=-0.46).CONCLUSION:The two-year efficacy and safety of PRK for the treatment of low myopia is excellent.Younger age and lower amount of refractive error are correlated with higher efficacy and safety indices of the surgery.展开更多
There is limited amount of research on surface plasmon resonance(SPR)sensors with self-referencing capabilities which are based on dielectric gratings.In the short-wavelength range,a metal grating sensor is capable of...There is limited amount of research on surface plasmon resonance(SPR)sensors with self-referencing capabilities which are based on dielectric gratings.In the short-wavelength range,a metal grating sensor is capable of simultaneously measuring liquid refractive index under proposed temperature.A fabricated gold grating is placed on one side of a thin gold film for refractive index measurement,while the other with polydimethylsiloxane(PDMS)is deposited on the other side for temperature measurement.We use finite element analysis to research its sensing characteristics.Due to the high refractive index sensitivity of SPR sensors and thermo-optic coefficient of PDMS,we discovered the maximum spectral sensitivity of the sensor is 564 nm/RIU and-50 pm/℃when the liquid refractive index ranges from 1.30 to 1.40 with temperature ranging from 0℃ to 100℃.Numerical results indicate that there may not be mutual interference between two channels for measuring refractive index and temperature,which reduces the complexity of sensor measurements.展开更多
A D-type photonic crystal fiber(PCF) sensor based on surface plasmon resonance(SPR) principle is designed.In order to excite the SPR effect,a gold film is plated on the open-loop channel of the sensor,the free electro...A D-type photonic crystal fiber(PCF) sensor based on surface plasmon resonance(SPR) principle is designed.In order to excite the SPR effect,a gold film is plated on the open-loop channel of the sensor,the free electrons in a metal are resonated with photons.The structural parameters are fine-tuned and the sensing performance of the sensor is studied.The results show that the maximum spectral sensitivity reaches 18 000 nm/RIU in the refractive index range of 1.24—1.32,and the maximum resolution is 5.56×10^(-6) RIU.The novel structure with high sensitivity and low refractive index provides a new perspective for fluid density detection.展开更多
AIM:To describe the demographics,clinical characteristics and treatment outcomes of childhood amblyopia in a tertiary eye center in western India.METHODS:This was a retrospective longitudinal hospital-based study of 1...AIM:To describe the demographics,clinical characteristics and treatment outcomes of childhood amblyopia in a tertiary eye center in western India.METHODS:This was a retrospective longitudinal hospital-based study of 1382 children aged≤12y included in the National Institute of OphthalMology AmBlyopia StUdy in Indian Paediatric EyeS(NIMBUS)Study.Data on patient demographics,treatment approach,and best-corrected visual acuity(BCVA)changes were reviewed.RESULTS:The mean age of the study cohort was 4.54±2.46y,with males constituting the majority(55.4%).The cause of amblyopia was refractive error in 73.2%,strabismus in 7.3%,and anisometropia in 6.8%of eyes.The majority of therapies comprised glasses(74.4%),followed by occlusion+glasses(10.3%),occlusion alone(7.3%),and surgery+patching+glasses(5.1%).The mean occlusion time was 2.46±1.14h.After a median follow-up of 10.00(6-85)mo,the mean BCVA significantly improved from 0.85±0.41 to 0.55±0.42 logMAR.Subgroup analysis revealed BCVA gain for all etiologies,including refractive errors(P<0.001),strabismus(P<0.001),cataract(P<0.001),and ptosis(P<0.001).Additionally,eyes with refractive errors showed significantly better BCVA than eyes with cataracts(P<0.001),strabismus(P<0.001)and marginally better BCVA than eyes with ptosis(P<0.05),both at the baseline and final visit.CONCLUSION:Refractive errors are the commonest cause of amblyopia,followed by strabismus and anisometropia.Timely detection,optimal therapy,and periodic follow-up are crucial in bettering visual acuity regardless of the cause.展开更多
AIM:To compare the effects of manipulating light levels versus manipulating the spectral content of short wavelengths(blue light)of ambient lighting on refractive development in young rabbits.METHODS:A total of 32 hea...AIM:To compare the effects of manipulating light levels versus manipulating the spectral content of short wavelengths(blue light)of ambient lighting on refractive development in young rabbits.METHODS:A total of 32 healthy 3-week-old rabbits were randomly assigned to one of the four groups with 8 in each group for 12wk:Control group(NC)under low blue light(output ratio of blue light 1.8%)at low illuminance(341 lx),HI group under low blue light(output ratio of blue light 1.6%)at high illuminance(5057 lx),simulating natural light(S-NL)group under high blue light(output ratio of blue light 4.9%)at high illuminance(5052 lx),and MB group under high blue light(output ratio of blue light 5.2%)at low illuminance(342 lx).The lighting in each group were provided by light emitting diode(LED)lamps emitting visible light(range 380-780 nm)in addition to(or not)LED lamps only emitting short wavelength(range 380-500 nm).Refraction,axial length,and corneal curvature radius were assessed by retinoscopy,ultrasonography and keratometry,respectively.Average data of both eyes for each animal were used as single values and compared among groups.RESULTS:During the 12-week intervention,all animals had an emmetropization period.The decrease of refraction in rabbits in HI group was similar to S-NL group,both slower than that of NC group(P<0.001).At the 12th week,the refraction(3.000±0.267 D)and vitreous cavity depth(7.421±0.168 mm)of S-NL was similar to HI group(3.250±0.267 D,7.264±0.256 mm),significantly different from NC group(1.937±0.291 D,7.825±0.313 mm;P<0.001 for both).High blue light at low illuminance had little effect on refraction change.At the end of intervention,the difference of refraction(2.219±0.281 D)and vitreous cavity depth(7.785±0.229 mm)in MB group were not statistically significant(P=0.311,P=0.749)compared with NC group.The other components were less affected by lighting conditions(P>0.05).CONCLUSION:The light levels per se but not the rich in spectral content of short wavelengths determine the inhibitory effect of ambient lighting on myopia development in rabbits.展开更多
AIM:To compare objective dry retinoscopy and subjective refraction measurements in patients with mild keratoconus(KCN)and quantify any differences.METHODS:This cross-sectional study was done on 68 eyes of 68 patients ...AIM:To compare objective dry retinoscopy and subjective refraction measurements in patients with mild keratoconus(KCN)and quantify any differences.METHODS:This cross-sectional study was done on 68 eyes of 68 patients diagnosed with mild KCN.Objective dry retinoscopy using autorefractometer and subjective refraction measurements were performed.Sphere,cylinder,J0,J45,and spherical equivalent values were compared between the two techniques.RESULTS:The mean age of 68 patients with mild KCN was 21.32±5.03y(12–35y).There were 37(54.4%)males.Objective refraction yielded significantly more myopic sphere(-1.44 D vs-0.57 D),higher cylinder magnitude(-2.24 D vs-1.48 D),and more myopic spherical equivalent(-2.56 D vs-1.31 D)compared to subjective refraction(all P<0.05).The mean differences were-0.87 D for sphere,-0.76 D for cylinder,and-1.25 D for spherical equivalent.No significant differences were found for J0 and J45 values,indicating agreement in astigmatism axis(P>0.05).CONCLUSION:In patients with mild KCN,objective dry retinoscopy overestimates the degree of myopia and astigmatism compared to subjective refraction.The irregular cornea in KCN likely impacts objective measurements.Subjective refraction allows compensation for irregularity,providing a more accurate correction.When determining refractive targets,the tendency of objective methods to overcorrect should be considered.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
AIM:To determine the diagnostic ability of various visual functions in patients with multiple sclerosis(MS)with and without optic neuritis(ON).METHODS:In this cross-sectional study,we assessed and compared refractive ...AIM:To determine the diagnostic ability of various visual functions in patients with multiple sclerosis(MS)with and without optic neuritis(ON).METHODS:In this cross-sectional study,we assessed and compared refractive error,visual acuity(VA),and contrast sensitivity(CS)between patients with MS and a matched control group of healthy individuals.The MS patients were further categorized into those with ON and those without.RESULTS:A total of 133 eyes from 133 participants were assessed,including 66 individuals diagnosed with MS.The mean ages for the MS group and the healthy control group were 37.5±4.27y and 38.45±4.60y,respectively(P=0.346).Among the 66 patients with MS,18 had ON.The presence of MS was associated with a decrease in best-corrected visual acuity(BCVA)and spherical component of refractive error(P<0.05),whereas ON did not lead to any further decline in these parameters(P>0.05).MS was linked to decreased CS at spatial frequencies of 6 and 18 cycles per degree(CPD;P<0.05),while ON in MS patients resulted in an additional decrease in CS at 3 CPD(P=0.03).The most significant sensitivity for distinguishing MS patients from healthy individuals as well as MS patients with ON from those without ON was found with cylindrical component[associated criterion(AC)>-0.75 D;71.21%]and CS at spatial frequency of 6 CPD(AC≤1.56;72.22%),respectively.Conversely,the highest specificity for these diagnostic measures was associated with BCVA(AC>0 logMAR;97.01%)and CS at a spatial frequency of 12 CPD(AC≤0.60;93.75%),respectively.CONCLUSION:MS significantly affects refractive error and CS,with ON further reducing CS.Assessing these visual parameters can improve MS monitoring and management.展开更多
Head waves are usually considered to be the refracted waves propagating along flat interfaces with an underlying higher velocity.However,the path that the rays travel along in media with irregular interfaces is not cl...Head waves are usually considered to be the refracted waves propagating along flat interfaces with an underlying higher velocity.However,the path that the rays travel along in media with irregular interfaces is not clear.Here we study the problem by simulation using a new approach of the spectral-element method with some overlapped elements（SEMO） that can accurately evaluate waves traveling along an irregular interface.Consequently,the head waves are separated from interface waves by a time window.Thus,their energy and arrival time changes can be analyzed independently.These analyses demonstrate that,contrary to the case for head waves propagating along a flat interface,there are two mechanisms for head waves traveling along an irregular interface：a refraction mechanism and transmission mechanism.That is,the head waves may be refracted waves propagating along the interface or transmitted waves induced by the waves propagating in the higher-velocity media.Such knowledge will be helpful in constructing a more accurate inversion method,such as head wave travel-time tomography,and in obtaining a more accurate model of subsurface structure which is very important for understanding the formation mechanism of some special areas,such as the Tibetan Plateau.展开更多
AIM:To evaluate the effects of refractive errors and binocular vision anomalies on the quality of life(QOL)of university students.METHODS:This cross-sectional analytical study was conducted on university students usin...AIM:To evaluate the effects of refractive errors and binocular vision anomalies on the quality of life(QOL)of university students.METHODS:This cross-sectional analytical study was conducted on university students using simple random sampling.Objective refraction,ocular alignment,vergence and accommodative performance were measured and assessed in all participants.Data on QOL were collected using the College of Optometrists in Vision Development-Quality of Life(COVD-QOL)Questionnaire.The effect of mentioned parameters on the QOL were evaluated.RESULTS:Totally 726 students with mean age of 21.35±1.88y were evaluated in this study,51.5%of whom were female.Esophoria was caused significantly lower QOL in the domains of somatic symptoms and occupationalphysical symptoms(P<0.05);Besides,esotropia decreased QOL in domains of somatic symptoms P=0.002 and psychological factors(P=0.023).Students with accommodation insufficiency experienced more symptoms in all domains(P<0.05)except for psychological factors(P=0.07).Increasing in the near point of convergence and accommodation and decreases QOL and increasing accommodative facility increases QOL(all P<0.05).Myopia and astigmatism cause decrease in QOL(both P<0.05),but hyperopic students had better QOL in comparison with others(P<0.05).CONCLUSION:Screening programs and treatment of refractive errors and binocular vision anomalies,especially phoria and accommodative insufficiency,positively impact the QOL and academic achievements of university students.展开更多
文摘An approximate analytic model is presented to describe spatial structure of refracted electromagnetic field arising at oblique incidence of a Gaussian beam on a plane boundary of an absorbing homogeneous medium. The analytic solution is obtained by asymptotic approximation of a Fourier field integral under the condition of great beam width in comparison with a wavelength (the geometrical-optics approximation). This model can be used also for approximate simulation of refracted field in the cases of beam incidence near the critical angle on transparent or absorbing (amplifying) refracting medium, if one artificially introduces the additional absorption (amplification), whose value is proportional to the ratio of the wavelength and the effective beam width. It is shown that the analytic model reflects the general features of refracted field at total internal reflection.
基金Supported by the "10th Five-Year" National Science and Technology Plan of China (Grant No.2003BA613A-09)China Innovation Foundation of Petroleum Technology for Young and Middle-Aged Scholars (Grant No.03E7018)
文摘Three-component seismic exploration through P-wave source and three-component geophone is an effective technique used in complicated reservoir exploration. In three-component seismic exploration data processing,one of the difficulties is static correction of converted wave. This paper analyzes propagation characteristics of non-converted and converted refracted waves,and discovers a favor-able condition for the formation of converted refracted wave,i.e. the velocity of overlaying medium S wave is much lower than that of underlying medium S wave. In addition,the paper proposes the static correction method of converted wave based on PPS converted refracted wave,and processes the real three-component seismic data with better results of static correction of converted wave.
基金Supported by Ongoing Research Funding Program(ORFFT-2025-054-1),King Saud University,Riyadh,Saudi Arabia.
文摘AIM:To evaluate the efficacy of the total computer vision syndrome questionnaire(CVS-Q)score as a predictive tool for identifying individuals with symptomatic binocular vision anomalies and refractive errors.METHODS:A total of 141 healthy computer users underwent comprehensive clinical visual function assessments,including evaluations of refractive errors,accommodation(amplitude of accommodation,positive relative accommodation,negative relative accommodation,accommodative accuracy,and accommodative facility),and vergence(phoria,positive and negative fusional vergence,near point of convergence,and vergence facility).Total CVS-Q scores were recorded to explore potential associations between symptom scores and the aforementioned clinical visual function parameters.RESULTS:The cohort included 54 males(38.3%)with a mean age of 23.9±0.58y and 87 age-matched females(61.7%)with a mean age of 23.9±0.53y.The multiple regression model was statistically significant[R²=0.60,F=13.28,degrees of freedom(DF=17122,P<0.001].This indicates that 60%of the variance in total CVS-Q scores(reflecting reported symptoms)could be explained by four clinical measurements:amplitude of accommodation,positive relative accommodation,exophoria at distance and near,and positive fusional vergence at near.CONCLUSION:The total CVS-Q score is a valid and reliable tool for predicting the presence of various nonstrabismic binocular vision anomalies and refractive errors in symptomatic computer users.
基金Supported by Vision International Eye Missions-USA,“One Drop for All”,Italy,and Private Donors in the Netherlands.
文摘AIM:To ascertain the pattern of ocular morbidity in a population of primary school children in rural Kenya as it is a prerequisite for planning effective preventive and therapeutic strategies.METHODS:A cross-sectional survey of ocular symptoms and clinical eye examinations were performed in a sample of 35 rural primary schools in the semi-arid region of Kajiado West sub-county in S.W.Kenya,amongst a seminomadic tribe(Maasai).Students in Grades 1-8 were included.Visual acuity was measured using the Snellen“tumbling E”chart at 6 m.Children with symptoms of refractive error underwent non-cycloplegic refraction.RESULTS:A total of 2036 children(1084 males)between the ages of 4-20y were examined.Conjunctival actinic changes were present in 22%(442/2036).Nine cases were seen with a potential squamous carcinoma.No overt classical ocular signs of vitamin A deficiency were noted,although 181(8.9%)children complained of nyctalopia.Three hundred thirty-six(16.5%)children had a visual acuity worse than 6/12 in either eye,were unable to read N10 near text at 40 cm or had symptoms suggestive of refractive error.Refractive data led to an estimate of hyperopia of+1.00 D or more in 3.9%and of myopia of-0.50 D or more in either eye in 3.0%of the study population.CONCLUSION:Solar exposure-and dust-related conjunctival pathology is common.As this may develop into potentially sight-or even life-threatening conditions,it warrants further study,and preventive strategies may be needed.Complaints of nyctalopia were common and could suggest vitamin A deficiency.The prevalence of refractive errors is low in this rural African population.
文摘Dear Editor,We present this case report which discusses a patient who underwent flap amputation after repeated attempts to resolve persistent and severe epithelial ingrowth following laser-assisted in situ keratomileusis(LASIK)surgery.Epithelial ingrowth is a known complication of LASIK surgery,typically manageable with minimal measures.However,severe cases may necessitate more aggressive interventions,such as flap amputation[1].LASIK is a widely performed refractive surgery with high success rates and excellent visual outcome[2].
基金supported by the University Sultan Moulay Slimane,Beni Mellal,Morocco。
文摘In this paper,we have calculated the structural,electronic,and optical properties of chalcogenide stannite Cu_(2)CdSnX4(X=S,Se,Te) materials.The calculations are based on the density functional theory (DFT) method and are performed using the Cambridge sequential total energy package (CASTEP) code included in the Biovia Material Studio 20 software.All optical properties have been studied in a domain that extends energetically from 10 meV to 40 eV.Our results show that Cu_(2)CdSnX4(X=S,Se,Te) stannite exhibits absorption in the visible region,the refractive index decreases with increasing energy,and the refractive index values are n=3.2,3.73 and 3.75 for Cu_(2)CdSnS_(4),Cu_(2)CdSnSe_(4)and Cu_(2)CdSnTe_(4),respectively.They show also high conductivity,which implies that this material is promising for solar cells.These results argue in favor of the use of these materials in various potential applications.The density of state,band structures,and structural properties of Cu_(2)CdSnX4(X=S,Se,and Te) stannite are also studied in this work.
文摘AIM:To evaluate the visual outcomes of implantable collamer lenses(ICLs)and identify the possible risk factors for ICL axis misalignment,and consequently,repositioning,explanting,or exchanging at a specialized eye hospital in Saudi Arabia.METHODS:The medical records of 813 eyes with different refractive errors corrected with ICL implantation were identified and included in this single-arm retrospective cohort study.The following data were collected:demographic characteristics,primary diagnosis,preoperative refraction,anterior chamber depth(ACD),white-to-white(WTW)measurement,endothelial cell density(ECD),and axial length.Patients’satisfaction and complaints,and their postoperative refraction,vault depth,and axis alignment with the preoperative target,were reviewed during the postoperative period.Collectively,these data were correlated with symptomatic axis rotation and the need for repositioning,explantation,or exchange due to high or low ICL vaults.RESULTS:Of 813 eyes,27(3.32%),13(1.59%),and 11(1.35%)required ICL repositioning,ICL explantation only without exchange,and ICL explantation with the placement of a new ICL,respectively.The mean follow-up period was 37.5mo.The main cause of explanation or exchange was incorrect WTW measurement in seven(29.17%)eyes,followed by high vault in four(16.56%)eyes.ICL repositioning was required in 27(3.32%)eyes with considerable rotation.Only 2(0.24%)eyes developed cataracts that required ICL removal,and retinal complications were reported in 7(0.86%)eyes.Long-term glaucoma and corneal decompensation were not observed in this cohort.CONCLUSION:With a high safety profile and reversibility,ICL implantation is a good alternative to corneal-based refractive surgery in eyes unsuitable for laser vision correction.The rate of secondary procedures in our study was 6.26%.Old age is a risk factor for secondary surgical interventions in the repositioning group,whereas abnormal vault and toric ICL rotation in the explantation group necessitated subsequent surgical procedures.Overall,ICL implantation demonstrates a good efficacy index and safety profile in patients with diverse refractive errors.
文摘A plasmonics waveguide structure that consist of a non-through metal–insulator–metal(MIM)waveguide coupled with a D-shaped cavity was designed.And the transmission properties,magnetic field distribution,and refractive index sensing functionality were simulated using the finite element method(FEM).A multi-Fano resonance phenomenon was clearly observable in the transmission spectra.The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the Dshaped resonant cavity and the continuum state of the non-through MIM waveguide.The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments.Additionally,the refractive index sensing properties,based on the Fano resonance,were investigated by varying the refractive index of the MIM waveguide's insulator layer.A maximum sensitivity and FOM of 1155 RIU/nm and 40 were achieved,respectively.This research opens up new possibilities for designing and exploring high-sensitivity photonic devices,micro-sensors,and innovative on-chip sensing architectures for future applications.
基金supported by the National Natural Science Foundation of China(No.12174199)the Wanjing Horizontal Research and Development Fund for Nature(No.HJ1060319960015).
文摘Based on optofluidics and whispering gallery mode(WGM)theory,here an optofluidic refractive index sensor with microtube-coupled suspended core fiber(SCF)is proposed.It solves the issues of general sensors with microcavity-coupled fiber taper such as too fragile,unstable performance due to open coupling,poor portability and repeatability,while overcoming the poor performance of low refractive index sensing in general full-package fiber sensors.The sensor only needs a very small amount of liquid sample(about 1.8 nL).The proposed sensor combines the excellent performance of full package,optofluidics and WGM resonator.The resonant characteristics and sensing performance of the sensor are analyzed and discussed by the theoretical simulation.The simulation results indicate that the sensor has a wide refractive index sensing range(1.330-1.700)and good performance.The resonance wavelength shift has a good linear relationship with the liquid refractive index variation.In the low refractive index region,the sensitivity is 222.5-247.5 nm/RIU,Q-factor is 1.03×10^(3) and the detection limit is 3.64×10^(-4) RIU.In the medium and high refractive index regions,the sensitivity is 564.4-846.2 nm/RIU,Q-factor is up to 8.62×10^(4),and the detection limit can be as low as 1.29×10^(-6) RIU.The sensor exhibits a high sensitivity,a high Q-factor and a very low detection limit.
文摘Blindness affected 45 million people globally in 2021,and moderate to severe vision loss a further 295 million.[1]The most common causes,cataract and uncorrected refractive error,are generally the easiest to treat,and are among the most cost-effective procedures in all of medicine and international development.[1-2]Thus,vision impairment is both extremely common and,in principle,readily manageable.
文摘AIM:To analyze the two-year visual and refractive outcomes as well as the safety,and efficacy of photorefractive keratectomy(PRK)surgery for myopia.METHODS:In this prospective cohort study,63 eligible patients were recruited,including 45 women(71.4%)and 18 men(28.6%).Demographic characteristics along with pre-and post-operative clinical data including visual acuity,refraction,maximum ablation,spherical and cylindrical error,and residual stromal bed(RSB)were evaluated.RESULTS:The mean age of the patients was 35.42±8.16y(range 22 to 55y).The mean spherical and cylindrical error before surgery were-2.23±1.58 D(range-5 to+0.25)and-1.24±0.94 D,respectively(range-3.75 to 0.00).The mean efficacy and safety of PRK surgery at 2y follow-up were 0.98±0.06 and 1.01±0.04 respectively.The lower age was significantly correlated with a higher amount of efficacy index(P<0.001,r=-0.42).Also,the lower amount of preoperative myopia and spherical equivalent(SE)were correlated with a higher safety index(P<0.001,r=-0.44;P<0.001,r=-0.46).CONCLUSION:The two-year efficacy and safety of PRK for the treatment of low myopia is excellent.Younger age and lower amount of refractive error are correlated with higher efficacy and safety indices of the surgery.
基金supported by the National Natural Science Foundation of China(No.52276094)the Education Project of Hunan Provincial Department(Nos.20B602 and 22C0112)+2 种基金the Industry University Education Cooperation Project(No.230803117185211)the Research Project on Teaching Reform in Ordinary Undergraduate Universities in Hunan Province(No.202401000142)the Natural Science Foundation of Hunan Province(No.2020JJ4935)。
文摘There is limited amount of research on surface plasmon resonance(SPR)sensors with self-referencing capabilities which are based on dielectric gratings.In the short-wavelength range,a metal grating sensor is capable of simultaneously measuring liquid refractive index under proposed temperature.A fabricated gold grating is placed on one side of a thin gold film for refractive index measurement,while the other with polydimethylsiloxane(PDMS)is deposited on the other side for temperature measurement.We use finite element analysis to research its sensing characteristics.Due to the high refractive index sensitivity of SPR sensors and thermo-optic coefficient of PDMS,we discovered the maximum spectral sensitivity of the sensor is 564 nm/RIU and-50 pm/℃when the liquid refractive index ranges from 1.30 to 1.40 with temperature ranging from 0℃ to 100℃.Numerical results indicate that there may not be mutual interference between two channels for measuring refractive index and temperature,which reduces the complexity of sensor measurements.
基金supported by the Natural Science Foundation of Tianjin City (No.19JCYBJC17000)the National Natural Science Foundation of China (No.11905159)。
文摘A D-type photonic crystal fiber(PCF) sensor based on surface plasmon resonance(SPR) principle is designed.In order to excite the SPR effect,a gold film is plated on the open-loop channel of the sensor,the free electrons in a metal are resonated with photons.The structural parameters are fine-tuned and the sensing performance of the sensor is studied.The results show that the maximum spectral sensitivity reaches 18 000 nm/RIU in the refractive index range of 1.24—1.32,and the maximum resolution is 5.56×10^(-6) RIU.The novel structure with high sensitivity and low refractive index provides a new perspective for fluid density detection.
文摘AIM:To describe the demographics,clinical characteristics and treatment outcomes of childhood amblyopia in a tertiary eye center in western India.METHODS:This was a retrospective longitudinal hospital-based study of 1382 children aged≤12y included in the National Institute of OphthalMology AmBlyopia StUdy in Indian Paediatric EyeS(NIMBUS)Study.Data on patient demographics,treatment approach,and best-corrected visual acuity(BCVA)changes were reviewed.RESULTS:The mean age of the study cohort was 4.54±2.46y,with males constituting the majority(55.4%).The cause of amblyopia was refractive error in 73.2%,strabismus in 7.3%,and anisometropia in 6.8%of eyes.The majority of therapies comprised glasses(74.4%),followed by occlusion+glasses(10.3%),occlusion alone(7.3%),and surgery+patching+glasses(5.1%).The mean occlusion time was 2.46±1.14h.After a median follow-up of 10.00(6-85)mo,the mean BCVA significantly improved from 0.85±0.41 to 0.55±0.42 logMAR.Subgroup analysis revealed BCVA gain for all etiologies,including refractive errors(P<0.001),strabismus(P<0.001),cataract(P<0.001),and ptosis(P<0.001).Additionally,eyes with refractive errors showed significantly better BCVA than eyes with cataracts(P<0.001),strabismus(P<0.001)and marginally better BCVA than eyes with ptosis(P<0.05),both at the baseline and final visit.CONCLUSION:Refractive errors are the commonest cause of amblyopia,followed by strabismus and anisometropia.Timely detection,optimal therapy,and periodic follow-up are crucial in bettering visual acuity regardless of the cause.
基金Supported by Natural Science Foundation of Sichuan Province(No.2022NSFSC0754)Project of Nanchong Science and Technology Bureau(No.22SXQT0350).
文摘AIM:To compare the effects of manipulating light levels versus manipulating the spectral content of short wavelengths(blue light)of ambient lighting on refractive development in young rabbits.METHODS:A total of 32 healthy 3-week-old rabbits were randomly assigned to one of the four groups with 8 in each group for 12wk:Control group(NC)under low blue light(output ratio of blue light 1.8%)at low illuminance(341 lx),HI group under low blue light(output ratio of blue light 1.6%)at high illuminance(5057 lx),simulating natural light(S-NL)group under high blue light(output ratio of blue light 4.9%)at high illuminance(5052 lx),and MB group under high blue light(output ratio of blue light 5.2%)at low illuminance(342 lx).The lighting in each group were provided by light emitting diode(LED)lamps emitting visible light(range 380-780 nm)in addition to(or not)LED lamps only emitting short wavelength(range 380-500 nm).Refraction,axial length,and corneal curvature radius were assessed by retinoscopy,ultrasonography and keratometry,respectively.Average data of both eyes for each animal were used as single values and compared among groups.RESULTS:During the 12-week intervention,all animals had an emmetropization period.The decrease of refraction in rabbits in HI group was similar to S-NL group,both slower than that of NC group(P<0.001).At the 12th week,the refraction(3.000±0.267 D)and vitreous cavity depth(7.421±0.168 mm)of S-NL was similar to HI group(3.250±0.267 D,7.264±0.256 mm),significantly different from NC group(1.937±0.291 D,7.825±0.313 mm;P<0.001 for both).High blue light at low illuminance had little effect on refraction change.At the end of intervention,the difference of refraction(2.219±0.281 D)and vitreous cavity depth(7.785±0.229 mm)in MB group were not statistically significant(P=0.311,P=0.749)compared with NC group.The other components were less affected by lighting conditions(P>0.05).CONCLUSION:The light levels per se but not the rich in spectral content of short wavelengths determine the inhibitory effect of ambient lighting on myopia development in rabbits.
文摘AIM:To compare objective dry retinoscopy and subjective refraction measurements in patients with mild keratoconus(KCN)and quantify any differences.METHODS:This cross-sectional study was done on 68 eyes of 68 patients diagnosed with mild KCN.Objective dry retinoscopy using autorefractometer and subjective refraction measurements were performed.Sphere,cylinder,J0,J45,and spherical equivalent values were compared between the two techniques.RESULTS:The mean age of 68 patients with mild KCN was 21.32±5.03y(12–35y).There were 37(54.4%)males.Objective refraction yielded significantly more myopic sphere(-1.44 D vs-0.57 D),higher cylinder magnitude(-2.24 D vs-1.48 D),and more myopic spherical equivalent(-2.56 D vs-1.31 D)compared to subjective refraction(all P<0.05).The mean differences were-0.87 D for sphere,-0.76 D for cylinder,and-1.25 D for spherical equivalent.No significant differences were found for J0 and J45 values,indicating agreement in astigmatism axis(P>0.05).CONCLUSION:In patients with mild KCN,objective dry retinoscopy overestimates the degree of myopia and astigmatism compared to subjective refraction.The irregular cornea in KCN likely impacts objective measurements.Subjective refraction allows compensation for irregularity,providing a more accurate correction.When determining refractive targets,the tendency of objective methods to overcorrect should be considered.
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.
文摘AIM:To determine the diagnostic ability of various visual functions in patients with multiple sclerosis(MS)with and without optic neuritis(ON).METHODS:In this cross-sectional study,we assessed and compared refractive error,visual acuity(VA),and contrast sensitivity(CS)between patients with MS and a matched control group of healthy individuals.The MS patients were further categorized into those with ON and those without.RESULTS:A total of 133 eyes from 133 participants were assessed,including 66 individuals diagnosed with MS.The mean ages for the MS group and the healthy control group were 37.5±4.27y and 38.45±4.60y,respectively(P=0.346).Among the 66 patients with MS,18 had ON.The presence of MS was associated with a decrease in best-corrected visual acuity(BCVA)and spherical component of refractive error(P<0.05),whereas ON did not lead to any further decline in these parameters(P>0.05).MS was linked to decreased CS at spatial frequencies of 6 and 18 cycles per degree(CPD;P<0.05),while ON in MS patients resulted in an additional decrease in CS at 3 CPD(P=0.03).The most significant sensitivity for distinguishing MS patients from healthy individuals as well as MS patients with ON from those without ON was found with cylindrical component[associated criterion(AC)>-0.75 D;71.21%]and CS at spatial frequency of 6 CPD(AC≤1.56;72.22%),respectively.Conversely,the highest specificity for these diagnostic measures was associated with BCVA(AC>0 logMAR;97.01%)and CS at a spatial frequency of 12 CPD(AC≤0.60;93.75%),respectively.CONCLUSION:MS significantly affects refractive error and CS,with ON further reducing CS.Assessing these visual parameters can improve MS monitoring and management.
基金supported by the National Natural Science Foundation of China (Grant Nos.40874027,90715020,and 90915012)the Institute of Geophysics of the China Earthquake Administration (Grant No.DQJB07B06)Special Public Welfare Industry (Grant Nos.20070804 and 200808008)
文摘Head waves are usually considered to be the refracted waves propagating along flat interfaces with an underlying higher velocity.However,the path that the rays travel along in media with irregular interfaces is not clear.Here we study the problem by simulation using a new approach of the spectral-element method with some overlapped elements（SEMO） that can accurately evaluate waves traveling along an irregular interface.Consequently,the head waves are separated from interface waves by a time window.Thus,their energy and arrival time changes can be analyzed independently.These analyses demonstrate that,contrary to the case for head waves propagating along a flat interface,there are two mechanisms for head waves traveling along an irregular interface：a refraction mechanism and transmission mechanism.That is,the head waves may be refracted waves propagating along the interface or transmitted waves induced by the waves propagating in the higher-velocity media.Such knowledge will be helpful in constructing a more accurate inversion method,such as head wave travel-time tomography,and in obtaining a more accurate model of subsurface structure which is very important for understanding the formation mechanism of some special areas,such as the Tibetan Plateau.
文摘AIM:To evaluate the effects of refractive errors and binocular vision anomalies on the quality of life(QOL)of university students.METHODS:This cross-sectional analytical study was conducted on university students using simple random sampling.Objective refraction,ocular alignment,vergence and accommodative performance were measured and assessed in all participants.Data on QOL were collected using the College of Optometrists in Vision Development-Quality of Life(COVD-QOL)Questionnaire.The effect of mentioned parameters on the QOL were evaluated.RESULTS:Totally 726 students with mean age of 21.35±1.88y were evaluated in this study,51.5%of whom were female.Esophoria was caused significantly lower QOL in the domains of somatic symptoms and occupationalphysical symptoms(P<0.05);Besides,esotropia decreased QOL in domains of somatic symptoms P=0.002 and psychological factors(P=0.023).Students with accommodation insufficiency experienced more symptoms in all domains(P<0.05)except for psychological factors(P=0.07).Increasing in the near point of convergence and accommodation and decreases QOL and increasing accommodative facility increases QOL(all P<0.05).Myopia and astigmatism cause decrease in QOL(both P<0.05),but hyperopic students had better QOL in comparison with others(P<0.05).CONCLUSION:Screening programs and treatment of refractive errors and binocular vision anomalies,especially phoria and accommodative insufficiency,positively impact the QOL and academic achievements of university students.
