【摘要】 背景:不同种类人工晶状体的材料和光学设计影响其光学特性,临床数据难以分析不同人工晶状体在眼内位移产生的人工晶状体眼调节。目的:观察不同人工晶状体种类在眼内位移过程中产生的人工晶状体眼调节变化。方法:在Zemax光学设计中构建Liou-Brennan眼模型,分别用材料和设计不同的不同种类人工晶状体替换自然晶状体,采用光线追迹原理计算人工晶状体前移产生的人工晶状体眼调节。结果与结论:随着人工晶状体前移距离增加,人工晶状体眼调节增加。丙烯酸和聚甲基丙烯酸甲酯人工晶状体前移产生的调节接近;凸平型和等双凸型设计人工晶状体前移产生的调节差别不显著;球面人工晶状体前移产生的调节略大于非球面人工晶状体。结果说明人工晶状体在眼内的位移引起焦点偏移,提供了一定调节,与人工晶状体眼的高阶像差、角膜的近视性散光和多焦性等因素共同构成人工晶状体眼的表观调节。人工晶状体种类对人工晶状体眼调节影响不显著。更多还原

【Abstract】 BACKGROUND:Intraocular lens(IOL) made from different materials and optical designs have different optical characteristics.It is hard to clinically analyze the amount of pseudophakic accommodation caused by IOL movement inside of the eye.OBJECTIVE:To study pseudophakic accommodation induced by intraocular movement of different types of intraocular lenses.METHODS:By using Zemax optical design program,the Liou-Brennan eye model implanted with different types of IOL was constructed.Ray-tracing method was adopted to calculate pseudophakic accommodation induced by IOL forward movements.RESULTS AND CONCLUSION:The pseudophakic accommodation was increased with IOL forward movement.IOL made from acrylic and polymethylmethacrylate induced similar rate of pseudophakic accommodation.It was not significantly different between IOL with optical design of convex-plano and equal-convex as well.Slight higher pseudophakic accommodation caused by spherical IOL forward movement than aspheric IOL.The type of IOLs did not have significant effect on pseudophakic accommodation.更多还原