Purpose:To inspect and compare the image quality of an aspheric intraocular lens(IQ,Alcon)with those of conventional monofocal silicone and acrylic intraocular lens and multifocal intraocular lens(Array).Methods:The I...Purpose:To inspect and compare the image quality of an aspheric intraocular lens(IQ,Alcon)with those of conventional monofocal silicone and acrylic intraocular lens and multifocal intraocular lens(Array).Methods:The IOLs were tested in the eye model,which was designed to be optically equivalent to the theoretical eye model.The eye model is a combination of a spherical photographic lens with 35 mm focal length(IOL put in a water cell)and a charge coupled device(CCD)camera.The images constructed by the lenses are observed on a monitor of personal computer and the contrasts of the images are analyzed by using commercial image processing software.SHARP value is used to measure and estimate image definition.Results:The images constructed by changing the diameter of aperture stop and IOL.Observed by this eye model,the image definition of aspheric intraocular lens(IQ,Alcon)is better than others.Discussion:The proposed eye model is useful for testing functional vision and for inspecting the differences of intraocular lens.展开更多
目的比较两种不同设计的一片式非球面人工晶状体（intraocular lens，IOL）植入后1个月和3个月的倾斜和偏心及全眼和眼内高阶像差成分、不同空间频率下的调制传递函数（modulation transfer function，MTF），指导临床两种非球面IOL选...目的比较两种不同设计的一片式非球面人工晶状体（intraocular lens，IOL）植入后1个月和3个月的倾斜和偏心及全眼和眼内高阶像差成分、不同空间频率下的调制传递函数（modulation transfer function，MTF），指导临床两种非球面IOL选择。方法临床病例对照研究。选取2013年3～5月在天津市眼科医院行白内障超声乳化联合IOL植入术的单纯性老年性自内障患者80只眼，根据角膜球差，40只眼植入Tecnis ZCB00 IOL（眼力健公司）；另40只眼植入ADAPT-AOIOL（博士伦公司），分别于术后1个月和3个月行iTrace视觉功能分析仪和Pentacam眼前段分析仪检查。记录6ram瞳孔下两种IOL的全眼及眼内高阶像差成分及MTF值，采用Image-pro plus图像分析软件计算出IOL的偏心值和倾斜度。组间采用独立样本f检验、组内采用配对f检验进行分析比较，各组倾斜度和偏心值行Pearson相关分析。结果2组术后1个月和3个月倾斜和偏心均无相关性差异无统计学意义（P〉0．05）。在倾斜和偏心上，术后1个月和3个月，2组组内及组间比较差异均无统计学意义（P〉0．05）。术后1个月和3个月，在全眼及眼内总高阶像差、彗差和球差上，2组组内比较差异无统计学意义（P〉0．05），但2组相比在全眼及眼内总高阶像差和球差上差异有统计学意义（P值分别为0．005，0．012，0．000，0．000，0．023，0．041，0．014，0．002），P〈0．05；但在眼内彗差上2组比较差异无统计学意义（P〉0．05）。在MTF上术后1个月和3个月，两组组内及组间比较差异无统计学意义（P〉0．05）。结论AO与ZCB00两种不同设计的一片式非球面IOL术后1个月和3个月均表现出良好的稳定性和居中性，在视觉质量上，ZCB00定程度上优于AO，但长远效果仍需进一步观察。展开更多
文摘由于无法统一衡量多点离焦近视防控镜片的防控效果,提出了一种简单快捷的新型离焦有效性评价模型——等效离焦指数(EDI,Equivalent Defocus Index)。利用软件仿真模拟分析了多点离焦镜片影响视觉质量及离焦相关的参数,给出EDI的定义,并以此计算3款典型排布的等效离焦指数,与调制传递函数(MTF,Modulation Transfer Function)的值进行比较,验证了该模型的有效性。
文摘Purpose:To inspect and compare the image quality of an aspheric intraocular lens(IQ,Alcon)with those of conventional monofocal silicone and acrylic intraocular lens and multifocal intraocular lens(Array).Methods:The IOLs were tested in the eye model,which was designed to be optically equivalent to the theoretical eye model.The eye model is a combination of a spherical photographic lens with 35 mm focal length(IOL put in a water cell)and a charge coupled device(CCD)camera.The images constructed by the lenses are observed on a monitor of personal computer and the contrasts of the images are analyzed by using commercial image processing software.SHARP value is used to measure and estimate image definition.Results:The images constructed by changing the diameter of aperture stop and IOL.Observed by this eye model,the image definition of aspheric intraocular lens(IQ,Alcon)is better than others.Discussion:The proposed eye model is useful for testing functional vision and for inspecting the differences of intraocular lens.
