influence of the characteristics of light transmission through the lens on the visual function of cataractou eyes

为了模拟通过混浊晶状体在视网膜上反射的图像，研究了白内障模型成像质量与混浊或混浊类型分级的关系。第一年进行了以下研究：1)通过提取的人核性白内障晶状体和大鼠晶状体的材料，阐明了体内光谱传递因子(T%)与光散射强度(SI)之间的相关性。2)将乳胶颗粒悬浮液注入中心腔，制作核性白内障晶状体的光学玻璃模型。模型透镜的混浊程度用T%和SI来量化，分辨率用调制传递函数(MTF)来评价。3)使用35 mm胶片的钢制相机，对通过模型镜头拍摄的图像的质量和细节进行了评价。通过核白内障透镜获得的图像与…相对应更有超过II级的日本白内障合作流行病学研究小组系统，显示出对比度和亮度的降低。在研究的第二年：1)研制了一种新型的核性及囊膜下白内障模型晶状体。1-1.为了更好地模拟人类晶状体环境，用切割波长低于390 nm的聚甲基丙烯酸甲酯(PMMA)制作了核性白内障模型。核性白内障模型为双凸型人工晶状体，混浊由亲水性和疏水性单体聚合而成。1-II.通过这种方式获得的图像是通过钢制相机获得的。对比度的降低通过削减紫外线来减小，使人的形象通过高达60%的透射镜可以被识别为对象。1-III.将由紫外线切割人工晶状体和硬性接触镜组成的囊下混浊模型晶状体附着在人工晶状体后，晶状体缝隙内植入白色小体。2)研制了一种用于图像模拟的新型摄像机。新相机的特点是：一个放在水中的模型镜头和一个用作摄影介质的ccd相机。可以很容易地实时观察反射图像并将图像输入计算机。用该相机对具有包膜下混浊的模型晶状体进行了检测。使用视力表、点光源、分辨率表和人像对模型透镜的图像进行评价。3)被膜下混浊的图像，即使在混浊区域扩大的情况下，在130CCT的SI下，图像的对比度和亮度在混浊中心也没有降低。4)通过特定病例的后囊下白内障对图像进行模拟。本研究通过两种类型的透镜混浊，成功地获得了图像质量的特征。较少

In order to simulate on image which is reflected on the retina through opacified lenses, the relationship between the quality of images through model catarctous and the grading of their opacification or opacification types was investigated. In the first year the following studies were performed : 1) Correlation between spectral transmisson factor (T%) and light scattering intensity (SI) in vivo was clarified by (or through) materials of extracted human nuclear cataract lenses and rat lenses. 2) The optical glass model of a lens with nuclear cataract was produced by a suspension of latex particles injected into the central cavity. The opacification grade of the model lenses was quantified by their T% and SI.The resolution of the lenses was evaluated by their modulation transfer function (MTF). 3) Using a steel camera with 35mm film, the quality and detail of photographed images through the model lenses were evaluated. The images obtained through the nuclear catarctous lens corresponded … More with over grade II of the Japanese Cataract Cooperative Epidemiology Study Group system, showing a decrease of contrast and brightness. In the second year of the study : 1) A new type of nuclear and subcapsular cataract model lens was developed. 1-1. To closely simulate human lens conditions, the nuclear cataract model was made of poly-methyl-methacrylate (PMMA) with a cutting wavelength below 390nm (UV). The shape of the nuclear cataract model was the biconvex IOL type and the opacification was made by the polymerization of both hydrophile and lyophobic monomers. 1-ii. Images through this mode were obtained through a steel camera. The decrease in contrast was diminished by cutting UV,making human figures recognizable as subjects through as much as 60% of the transmission lens. 1-iii. The model lens of subcapsular opacification composed of UV-cut IOL and hard contact lens (HCL) was attached behind IOL and whitish corpuscles were inserted in the gap between the lenses. 2) A new type of camera for image simulation was developed. The characteristics of the new camera are ; a model lens which is held in water and a CCD camera that is used as a photographic medium. Real time observation of the reflected images and image input into the computer were easily possible. The model lens with subcapsular opacity was examined by the new camera. To evaluate images through the model lenses, a visual acuity chart, point light source, resolution chart and human figure were used. 3) Images obtained through the model with subcapsular opacity did not show any decrease in image contrast or brightness under 130 cct of SI at the center of the opacity even when the opaque area was enlarged. 4) The simulation of an image was performed through a posterior subcapsular cataract for a particular case. The study was able to successfully obtain the characteristics of image quality through two types of lens opacification. Less