Atchison David A, Cooke David L
Centre for Vision and Eye Research, Optometry and Vision Science, Queensland University of Technology, Kelvin Grove, Queensland, Australia.
Great Lakes Eye Care, Saint Joseph, Michigan, USA.
Ophthalmic Physiol Opt. 2024 Jan;44(1):177-181. doi: 10.1111/opo.13249. Epub 2023 Nov 14.
A thin lens technique was developed to determine how the effective powers of toric monofocal intraocular lenses (IOLs) are influenced by tilt and the refractive errors associated with the tilt. A series of steps determined the effective power of the cornea at the IOL, the IOL power, the effective power of the tilted IOL, the correction required at the front of the eye and the power of an IOL that would compensate for the tilt. The correction was determined by starting at the ideal reduced image vergence at the IOL, backwards raytracing to obtain a reduced image vergence at the cornea, and subtracting the cornea power from this reduced image vergence. Examples are presented for different situations where the IOL is either tilted about the vertical or an oblique axis. Raytracing with a thick lens verified the accuracy of the technique.
一种薄透镜技术被开发出来，以确定复曲面单焦点人工晶状体（IOL）的有效屈光力如何受到倾斜以及与倾斜相关的屈光不正的影响。一系列步骤确定了人工晶状体处角膜的有效屈光力、人工晶状体的屈光力、倾斜人工晶状体的有效屈光力、眼前部所需的矫正以及可补偿倾斜的人工晶状体的屈光力。通过从人工晶状体处的理想简化像聚散度开始，反向光线追迹以获得角膜处的简化像聚散度，并从该简化像聚散度中减去角膜屈光力来确定矫正。给出了人工晶状体围绕垂直轴或倾斜轴倾斜的不同情况的示例。用厚透镜进行光线追迹验证了该技术的准确性。
