该文基于GullstrandⅠ号模型眼,设计一种用于检测眼底成像设备的简化模型眼,模型眼达到如下要求:(1)其屈光特性模拟实际人眼屈光组织,等效空气中焦距为17 mm;(2)相邻材料的相对折射率差均与GullstrandⅠ号模型眼屈光组织任意相邻的两层(角膜与房水、房水与晶状体、晶状体与玻璃体)之间的相对折射率差的偏差不大于1％;(3)在入射光阑为3 mm的情况下,近轴光与轴外光的弥散斑半径与GullstrandⅠ号模型眼偏差不大于15％;(4)主光线与眼底切线的夹角与GullstrandⅠ号模型眼偏差不大于1°;(5)在入射光阑为3 mm的情况下,近轴光的MTF数值与GullstrandⅠ号模型眼偏差不大于0.1.简化模型眼可预期替代ISO 10940:2009《眼科仪器眼底照相机》中的测量方法,用作检测眼底成像设备.%Based on the Gullstrand Ⅰ model eye, a simpli?ed model eye for testing fundus imaging device is designed. The model eye can reach the following requirements: (1) The refractive characteristics of the ocular refractive tissue are simulated, and the equivalent focal length in air is 17 mm; (2) The differences between relative refractive index differences of the adjacent materials of the simplified model eye and relative refractive index differences of any adjacent two layers (cornea and aqueous humor, aqueous humor and lens, lens and vitreous body) of the Gullstrand Ⅰ model eye are not more than 1％; (3) In the case of the incident aperture diameter of 3 mm, the differences of radii of the diffuse spots formed by the paraxial light and the axial light are not more than 15％; (4) The differences of angles of chief ray and tangent line of the fundus are not more than 1°; (5) In the case of the incident aperture diameter of 3 mm, the differences of MTF values of the near axis light are not more than 0.1. The simpli?ed model eye can be expected to be used for testing fundus imaging device instead of the test method in ISO 10940: 2009 Ophthalmic instruments — Fundus cameras.
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