Institute for Applied Optics and Electronics, Cologne University of Applied Sciences, Betzdorfer Str. 2, 50679, Cologne, North Rhine-Westphalia, Germany.
Sci Rep. 2023 Jan 17;13(1):908. doi: 10.1038/s41598-023-27521-7.
Multifocal intraocular lenses incorporate a variety of design considerations, including dimensioning of the base monofocal shape and the diffraction grating. While studying three different lens models, we present a practical approach for mathematical modelling and evaluation of these geometries. Contrary to typical lens measurement methods, non-contact measurements were performed on the Alcon SN6AD1, HumanOptics MS 612 DAY and the AMO ZMA00 lenses using a confocal microscope. Subsequent data processing includes centering, tilting correction, filtering and an algorithmic decomposition into a conic and polynomial part and the diffraction grating. Lastly, evaluation of fitting parameters and grating shape is done to allow for inferences about further optical properties. Results and analysis show the confocal microscope to be a suitable imaging method for lens measurements. The processing of this data enables the reconstruction of the annular diffraction grating over the complete lens diameter. Apodization, near addition and diffraction efficiency characteristics are found utilizing the grating shape. Additionally, near-optical axis curvature, asphericity and higher order polynomials are identified qualitatively from the reconstruction of the monofocal base form. Derived properties also include the lens optical base and addition power. By making use of the surface geometries, as well as the lens' material and thickness, a full lens model can be created for further studies. In summary, our analytical approach enables the insight to various intraocular lens design decisions. Furthermore, this procedure is suitable for lens model creation for research and simulation.
多焦点人工晶状体融合了多种设计考虑因素，包括基底单焦点形状和衍射光栅的尺寸。在研究三种不同的镜片模型时，我们提出了一种用于这些几何形状的数学建模和评估的实用方法。与典型的镜片测量方法不同，我们使用共聚焦显微镜对 Alcon SN6AD1、HumanOptics MS 612 DAY 和 AMO ZMA00 镜片进行了非接触测量。随后的数据处理包括中心定位、倾斜校正、滤波以及通过算法将其分解为圆锥和多项式部分和衍射光栅。最后，对拟合参数和光栅形状进行评估，以便对进一步的光学特性进行推断。结果和分析表明，共聚焦显微镜是一种适合镜片测量的成像方法。该数据的处理使得能够在整个镜片直径上重建环形衍射光栅。利用光栅形状可以找到光瞳渐变、近添加和衍射效率特性。此外，还可以从单焦点基底形式的重建中定性地识别近光轴曲率、非球面度和高阶多项式。衍生属性还包括镜片的光学基底和附加光焦度。通过利用表面几何形状以及镜片的材料和厚度，可以为进一步的研究创建完整的镜片模型。总之，我们的分析方法使我们能够深入了解各种人工晶状体的设计决策。此外，该程序还适用于研究和模拟用的镜片模型创建。
