AIM： To analytically assess the effect of pupil size upon the refractive power distributions of different designs of multifocal contact lenses.METHODS： Two multifocal contact lenses of center-near design and one mul...AIM： To analytically assess the effect of pupil size upon the refractive power distributions of different designs of multifocal contact lenses.METHODS： Two multifocal contact lenses of center-near design and one multifocal contact lens of center-distance design were used in this study. Their power profiles were measured using the NIMO TR1504 device （LAMBDA-X, Belgium）. Based on their power profiles, the power distribution was assessed as a function of pupil size. For the high addition lenses, the resulting refractive power as a function of viewing distance （far, intermediate, and near） and pupil size was also analyzed.RESULTS： The power distribution of the lenses was affected by pupil size differently. One of the lenses showed a significant spread in refractive power distribution, from about ？3 D to 0 D. Generally, the power distribution of the lenses expanded as the pupil diameter became greater. The surface of the lens dedicated for each distance varied substantially with the design of the lens.CONCLUSION： In an experimental basis, our results show how the lenses power distribution is affected by the pupil size and underlined the necessity of careful evaluation of the patient’s visual needs and the optical properties of a multifocal contact lens for achieving the optimal visual outcome.展开更多
目的探究角膜塑形镜治疗后暗室对比敏感度与调制传递函数截止频率(modulation transfer function cutoff,MTF cutoff)变化,并分析瞳孔与光学区的大小对暗室下对比敏感度以及MTF cutoff的影响。方法选取2015年8月至12月在天津医科大学眼...目的探究角膜塑形镜治疗后暗室对比敏感度与调制传递函数截止频率(modulation transfer function cutoff,MTF cutoff)变化,并分析瞳孔与光学区的大小对暗室下对比敏感度以及MTF cutoff的影响。方法选取2015年8月至12月在天津医科大学眼科医院进行角膜塑形镜治疗的近视青少年40人(右眼40眼),戴镜前、戴镜后6个月分别测量角膜地形图、暗室瞳孔大小、光学区大小、暗室及暗室眩光条件下对比敏感度曲线下面积(area under log contrast sensitivity function,AULCSF)及MTF cutoff,戴镜前后视觉质量参数变化采用配对t检验,暗室瞳孔与光学区对视觉质量参数的影响采用Pearson相关分析。结果戴镜后6个月等效球镜度数降低(P<0.001),柱镜度数无变化(P=0.879);暗室对比敏感度及暗室眩光条件下对比敏感度均下降(均为P<0.001);MTF cutoff下降(P<0.001)。戴镜前后瞳孔直径为(6.50±0.34)mm。戴镜后6个月光学区直径为(4.05±0.24)mm。暗室条件下AULCSF变化与暗室瞳孔直径及光学区直径均不相关(r=0.159,P=0.307;r=-0.223,P=0.167),暗室眩光条件下AULCSF变化与暗室瞳孔直径及光学区直径均不相关(r=0.174,P=0.289;r=-0.200,P=0.216)。MTF cutoff变化与暗室瞳孔直径及光学区直径相关(r=0.509,P=0.001;r=-0.511,P=0.001),暗室、暗室眩光条件下AULCSF及MTF cutoff变化均与瞳孔直径和光学区直径之差相关(均为P<0.05)。结论角膜塑形镜配戴后暗室对比敏感度及MTF cutoff均降低,且较小的暗室瞳孔与较大的光学区可获得更好的视觉质量。展开更多
建立了一种基于图像处理的快速瞳孔直径检测算法,运用此算法提取了反映阿片类药物成瘾人员与正常人对瞳孔光反射变化差异的3个特征值:绝对收缩幅度(absolute amplitude of contraction,AAC)、相对收缩幅度(relative amplitude of contra...建立了一种基于图像处理的快速瞳孔直径检测算法,运用此算法提取了反映阿片类药物成瘾人员与正常人对瞳孔光反射变化差异的3个特征值:绝对收缩幅度(absolute amplitude of contraction,AAC)、相对收缩幅度(relative amplitude of contraction,RAC)和收缩斜率(SCV,slope of contraction velocity);分别研究了成瘾、性别、近视、年龄、睡眠剥夺等因素对于这3个特征值的影响。不同性别、近视人员、睡眠剥夺人员与正常人之间的3个特征值均无显著差异,成瘾人员与之对比均显著减小。老年人相对于正常青年人,3个特征值都明显减小;与成瘾人员相比,仅在RAC值上有显著差异。结果表明,阿片类药物成瘾人员除了与正常人外,也与其他具有潜在影响瞳孔变化因素的非阿片成瘾人员在瞳孔对光反射的特征值上具有显著差异。该研究的实验数据为进一步建立基于检测瞳孔对光反射其直径发生变化的方法来快速、非接触地鉴别出阿片类药物成瘾人员提供了可靠的依据。展开更多
AIM:To compare the visual performance of pseudophakic eyes implanted with Al-UV and SN60WF aspheric intraocular lens(IOL),and to investigate the correlations between visual quality parameters and pupil size.METHODS:Th...AIM:To compare the visual performance of pseudophakic eyes implanted with Al-UV and SN60WF aspheric intraocular lens(IOL),and to investigate the correlations between visual quality parameters and pupil size.METHODS:This prospective comparative study included 105 eyes of 90 patients with age-related cataract who underwent uneventful phacoemulsification.The subjects were divided into two groups according to the implanted IOL type.Three months postoperatively,visual acuity and contrast sensitivity were measured,wave-front aberrations were assessed using a KR-IW aberrometer(Topcon),and objective optical quality parameters were performed using an optical quality analysis system-OQAS Il(Visiometrics).Independent sample Mest and Spearman correlation analysis were used for data analysis.RESULTS:There were no significant differences found in visual acuity,contrast sensitivity and visual quality parameters between the two groups(P>0.05).The measured intraocular spherical aberration(SA)in Al-UV IOL eyes of-0.19±0.05 pm was close to the designed SA value of-0.20 pm.The modulation transfer function cutoff,Strehl ratio and OQAS values were negatively correlated with pupil size in both groups(P<0.01).CONCLUSION:The subjective and objective visual quality in pseudophakic eyes with A1-UV and SN60WF IOLs are comparable.For aspheric IOL eyes,visual quality decreases with increasing pupil size.展开更多
目的:探讨准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)对托吡卡胺角膜渗透性的影响。方法:对34例(64眼)接受LASIK治疗的近视眼患者,于术前和术后1mo测量并比较10g/L托吡卡胺扩瞳后5,10,15,20min以及25min时的瞳孔大...目的:探讨准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)对托吡卡胺角膜渗透性的影响。方法:对34例(64眼)接受LASIK治疗的近视眼患者,于术前和术后1mo测量并比较10g/L托吡卡胺扩瞳后5,10,15,20min以及25min时的瞳孔大小,并记录瞳孔达到6mm大小所需时间。结果:平均中央角膜厚度由术前555.4±32.3μm下降至术后475.6±33.5μm,差异有显著意义。术后1mo10g/L托吡卡胺扩瞳后10,15,20min时的瞳孔直径明显大于术前相应时间点的瞳孔大小,而5,25min时的瞳孔大小无显著性差别。瞳孔达到6mm大小所需平均时间由术前14.66±4.28min减少至12.42±2.16min。结论:LASIK术后托吡卡胺的扩瞳作用显著加快。LASIK导致的角膜变薄增强了托吡卡胺的角膜渗透性。展开更多
Accurately recognizing facial expressions is essential for effective social interactions.Non-human primates(NHPs)are widely used in the study of the neural mechanisms underpinning facial expression processing,yet it r...Accurately recognizing facial expressions is essential for effective social interactions.Non-human primates(NHPs)are widely used in the study of the neural mechanisms underpinning facial expression processing,yet it remains unclear how well monkeys can recognize the facial expressions of other species such as humans.In this study,we systematically investigated how monkeys process the facial expressions of conspecifics and humans using eye-tracking technology and sophisticated behavioral tasks,namely the temporal discrimination task(TDT)and face scan task(FST).We found that monkeys showed prolonged subjective time perception in response to Negative facial expressions in monkeys while showing longer reaction time to Negative facial expressions in humans.Monkey faces also reliably induced divergent pupil contraction in response to different expressions,while human faces and scrambled monkey faces did not.Furthermore,viewing patterns in the FST indicated that monkeys only showed bias toward emotional expressions upon observing monkey faces.Finally,masking the eye region marginally decreased the viewing duration for monkey faces but not for human faces.By probing facial expression processing in monkeys,our study demonstrates that monkeys are more sensitive to the facial expressions of conspecifics than those of humans,thus shedding new light on inter-species communication through facial expressions between NHPs and humans.展开更多
基金Supported by the AGEYE project(No.608049)the Marie Curie Initial Training Network program(No.FP7-PEOPLE-2013-ITN)the European Commission,Brussels,Belgium and by an Atraccióde Talent(University of Valencia)research scholarship granted to Antonio J.Deláguila-Carrasco(No.UV-INV-PREDOC14-179135)
文摘AIM： To analytically assess the effect of pupil size upon the refractive power distributions of different designs of multifocal contact lenses.METHODS： Two multifocal contact lenses of center-near design and one multifocal contact lens of center-distance design were used in this study. Their power profiles were measured using the NIMO TR1504 device （LAMBDA-X, Belgium）. Based on their power profiles, the power distribution was assessed as a function of pupil size. For the high addition lenses, the resulting refractive power as a function of viewing distance （far, intermediate, and near） and pupil size was also analyzed.RESULTS： The power distribution of the lenses was affected by pupil size differently. One of the lenses showed a significant spread in refractive power distribution, from about ？3 D to 0 D. Generally, the power distribution of the lenses expanded as the pupil diameter became greater. The surface of the lens dedicated for each distance varied substantially with the design of the lens.CONCLUSION： In an experimental basis, our results show how the lenses power distribution is affected by the pupil size and underlined the necessity of careful evaluation of the patient’s visual needs and the optical properties of a multifocal contact lens for achieving the optimal visual outcome.
文摘建立了一种基于图像处理的快速瞳孔直径检测算法,运用此算法提取了反映阿片类药物成瘾人员与正常人对瞳孔光反射变化差异的3个特征值:绝对收缩幅度(absolute amplitude of contraction,AAC)、相对收缩幅度(relative amplitude of contraction,RAC)和收缩斜率(SCV,slope of contraction velocity);分别研究了成瘾、性别、近视、年龄、睡眠剥夺等因素对于这3个特征值的影响。不同性别、近视人员、睡眠剥夺人员与正常人之间的3个特征值均无显著差异,成瘾人员与之对比均显著减小。老年人相对于正常青年人,3个特征值都明显减小;与成瘾人员相比,仅在RAC值上有显著差异。结果表明,阿片类药物成瘾人员除了与正常人外,也与其他具有潜在影响瞳孔变化因素的非阿片成瘾人员在瞳孔对光反射的特征值上具有显著差异。该研究的实验数据为进一步建立基于检测瞳孔对光反射其直径发生变化的方法来快速、非接触地鉴别出阿片类药物成瘾人员提供了可靠的依据。
基金Supported by Project of Science&Technology Department of Sichuan Province(No.2019YJ0381)Key Project of Sichuan Health and Family Planning Commission(No.18ZD022).
文摘AIM:To compare the visual performance of pseudophakic eyes implanted with Al-UV and SN60WF aspheric intraocular lens(IOL),and to investigate the correlations between visual quality parameters and pupil size.METHODS:This prospective comparative study included 105 eyes of 90 patients with age-related cataract who underwent uneventful phacoemulsification.The subjects were divided into two groups according to the implanted IOL type.Three months postoperatively,visual acuity and contrast sensitivity were measured,wave-front aberrations were assessed using a KR-IW aberrometer(Topcon),and objective optical quality parameters were performed using an optical quality analysis system-OQAS Il(Visiometrics).Independent sample Mest and Spearman correlation analysis were used for data analysis.RESULTS:There were no significant differences found in visual acuity,contrast sensitivity and visual quality parameters between the two groups(P>0.05).The measured intraocular spherical aberration(SA)in Al-UV IOL eyes of-0.19±0.05 pm was close to the designed SA value of-0.20 pm.The modulation transfer function cutoff,Strehl ratio and OQAS values were negatively correlated with pupil size in both groups(P<0.01).CONCLUSION:The subjective and objective visual quality in pseudophakic eyes with A1-UV and SN60WF IOLs are comparable.For aspheric IOL eyes,visual quality decreases with increasing pupil size.
文摘目的:探讨准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)对托吡卡胺角膜渗透性的影响。方法:对34例(64眼)接受LASIK治疗的近视眼患者,于术前和术后1mo测量并比较10g/L托吡卡胺扩瞳后5,10,15,20min以及25min时的瞳孔大小,并记录瞳孔达到6mm大小所需时间。结果:平均中央角膜厚度由术前555.4±32.3μm下降至术后475.6±33.5μm,差异有显著意义。术后1mo10g/L托吡卡胺扩瞳后10,15,20min时的瞳孔直径明显大于术前相应时间点的瞳孔大小,而5,25min时的瞳孔大小无显著性差别。瞳孔达到6mm大小所需平均时间由术前14.66±4.28min减少至12.42±2.16min。结论:LASIK术后托吡卡胺的扩瞳作用显著加快。LASIK导致的角膜变薄增强了托吡卡胺的角膜渗透性。
基金supported by the National Natural Science Foundation of China (U20A2017)Guangdong Basic and Applied Basic Research Foundation (2022A1515010134,2022A1515110598)+2 种基金Youth Innovation Promotion Association of Chinese Academy of Sciences (2017120)Shenzhen-Hong Kong Institute of Brain Science–Shenzhen Fundamental Research Institutions (NYKFKT2019009)Shenzhen Technological Research Center for Primate Translational Medicine (F-2021-Z99-504979)。
文摘Accurately recognizing facial expressions is essential for effective social interactions.Non-human primates(NHPs)are widely used in the study of the neural mechanisms underpinning facial expression processing,yet it remains unclear how well monkeys can recognize the facial expressions of other species such as humans.In this study,we systematically investigated how monkeys process the facial expressions of conspecifics and humans using eye-tracking technology and sophisticated behavioral tasks,namely the temporal discrimination task(TDT)and face scan task(FST).We found that monkeys showed prolonged subjective time perception in response to Negative facial expressions in monkeys while showing longer reaction time to Negative facial expressions in humans.Monkey faces also reliably induced divergent pupil contraction in response to different expressions,while human faces and scrambled monkey faces did not.Furthermore,viewing patterns in the FST indicated that monkeys only showed bias toward emotional expressions upon observing monkey faces.Finally,masking the eye region marginally decreased the viewing duration for monkey faces but not for human faces.By probing facial expression processing in monkeys,our study demonstrates that monkeys are more sensitive to the facial expressions of conspecifics than those of humans,thus shedding new light on inter-species communication through facial expressions between NHPs and humans.
