单片与双片式可调节人工晶体屈光调节力研究(英文)

Induced Accommodation Comparison of Singlet Versus Doublet Accommodating Intraocular Lens

给出了一种双片式可调节人工晶体模型,并通过符合实际人眼情况的模拟方法,即人工晶体在眼内移动后,在接近相同人眼成像质量条件下,比较了正透镜-正透镜、负透镜-正透镜、正透镜-负透镜三种不同组合形式的双片式可调节人工晶体和单片式可调节人工晶体对人眼屈光调节力影响,结果表明:当正透镜-负透镜组合的双片式可调节人工晶体的正透镜在相对负透镜移动的距离与单片式可调节人工晶体在眼内移动距离相等时,该型双片式可调节人工晶体使人眼获得的屈光调节力明显较高,且屈光调节力的大小随正透镜和负透镜屈光度的增大而增大,正透镜-正透镜、负透镜-正透镜型人工晶体屈光调节力低于单片式人工晶体,对人眼成像质量影响较大的球差Z40项从0.096到0.263变化,人眼屈光调节力仅改变0.03D,以上所得结论为设计新一代的双片式可调节人工晶体提供了一定的理论基础。

A new model of doublet Accommodating Intraocular Lens （AIOL） is proposed by using a reasonable simulation method which is more applicable for the practical case of human eyes. The induced accommodation of the singlet AIOL and doublet AIOL including the combination of two positive lenses, positive-negative lenses and negative-positive lenses are compared with nearly the same vision performance for the eyes implanted with these AIOLs. These results show that the induced accommodation of doublet AIOL constituted by two positive lenses or an anterior negative lens and a posterior positive lens is lower than that of the singlet AIOL, the induced accommodation of doublet AIOL comprising an anterior positive lens and a posterior negative lens is obviously higher than that of the singlet AIOL, and the accommodation amount increases with the power of anterior lens. When the spherical aberration Z4^0 varies from 0.096 to 0.263, the tuning range of the effective accommodation is only 0.03D. The above results may be helpful for understanding the current designs and developing doublet AIOL.