EDOF 眼内晶状体设计：像平面与物体会聚的偏移。
EDOF intraocular lens design: shift in image plane vs object vergence.
机构信息
Department of Experimental Ophthalmology, Saarland University, 66424, Homburg, Saarland, Germany.
School of Physical Sciences, The Open University, MK7 6AA, Milton Keynes, UK.
出版信息
BMC Ophthalmol. 2023 Oct 2;23(1):397. doi: 10.1186/s12886-023-03144-4.
BACKGROUND
To compare 2 different design scenarios of EDOF-IOLs inserted in the Liou-Brennan schematic model eye using raytracing simulation as a function of pupil size.
METHODS
Two EDOF IOL designs were created and optimized for the Liou-Brennan schematic model eye using Zemax ray tracing software. Each lens was optimized to achieve a maximum Strehl ratio for intermediate and far vision. In the first scenario, the object was located at infinity (O1), and the image plane was positioned at far focus (I1) and intermediate focus (I2) to emulate far and intermediate distance vision, respectively. In the second scenario, the image plane was fixed at I1 according to the first scenario. The object plane was set to infinity (O1) for far-distance vision and then shifted closer to the eye (O2) to reproduce the corresponding intermediate vision. The performance of both IOLs was simulated for the following 3 test conditions as a function of pupil size: a) O1 to I1, b) O1 to I2, and c) O2 to I1. To evaluate the imaging performance, we used the Strehl ratio, the root-mean-square (rms) of the spot radius, and the spherical aberration of the wavefront for various pupil sizes.
RESULTS
Evaluating the imaging performance of the IOLs shows that the imaging performance of the IOLs is essentially identical for object/image at O1/I1. Designed IOLs perform dissimilarly to each other in near-vision scenarios, and the simulations confirm that there is a slight difference in their optical performance.
CONCLUSION
Our simulation study recommends considering the difference between object shift and image plane shift in design and test conditions to achieve more accurate pseudoaccommodation after cataract surgery.
背景
通过光线追踪模拟，比较两种不同设计方案的 EDOF-IOL 在 Liou-Brennan schematic 模型眼中的表现，以瞳孔大小为函数。
方法
使用 Zemax 光线追踪软件为 Liou-Brennan schematic 模型眼创建并优化了两种 EDOF IOL 设计。每个镜头都经过优化，以在中间和远距离视力中获得最大斯特列尔比。在第一种方案中，物体位于无穷远（O1），像平面位于远焦点（I1）和中间焦点（I2），分别模拟远距和中距视力。在第二种方案中，像平面根据第一种方案固定在 I1。物体平面设置为无穷远（O1）以模拟远距视力，然后移近眼睛（O2）以再现相应的中距视力。模拟了两种 IOL 在以下三种测试条件下随瞳孔大小变化的性能：a）O1 到 I1，b）O1 到 I2，和 c）O2 到 I1。为了评估成像性能，我们使用斯特列尔比、光斑半径的均方根（rms）和波前的球面像差来评估各种瞳孔大小下的成像性能。
结果
评估 IOL 的成像性能表明，在 O1/I1 处的物体/像时，IOL 的成像性能基本相同。在近距视力场景中，设计的 IOL 彼此表现不同，模拟证实它们的光学性能略有差异。
结论
我们的模拟研究建议在设计和测试条件中考虑物体移位和像平面移位之间的差异，以实现白内障手术后更准确的假性调节。
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