Appl Opt. 2020 May 1;59(13):D54-D58. doi: 10.1364/AO.383581.
A new class of diffraction-based corneal inlays for treatment of presbyopia is described. The inlay is intended to achieve an improvement of the near focus quality over previous designs. Our proposal is a two-zone hybrid device with separated amplitude and phase areas having a central aperture and no refractive power. An array of micro-holes is distributed on the surface of the inlay conforming a binary photon sieve. In this way, the central hole of the disk contributes to the zero order of diffraction, and the light diffracted by the micro-holes in the peripheral photon sieve produces a real focus for near vision. We employed ray-tracing software to study the performance of the new inlay in the Liou-Brennan model eye. The modulation transfer functions (MTFs) at the distance and near foci, and the area under the MTFs for different object vergences, were the merit functions used in the evaluation. The results were compared with those obtained with previous pure amplitude designs. Additionally, image simulations were performed with the inlays in the model eye to show the good performance of our proposal in improving the quality of the near vision.
一种用于治疗远视的新型基于衍射的角膜镶嵌物被描述。这种镶嵌物旨在改善以前设计的近焦点质量。我们的建议是一种具有两个区域的混合器件，具有分离的幅度和相位区域，具有中央孔径和无折射力。微孔阵列分布在镶嵌物的表面上，形成二进制光子筛。这样，圆盘的中心孔有助于零阶衍射，而外围光子筛中的微孔衍射的光产生近视力的实际焦点。我们使用光线追踪软件研究了新型镶嵌物在 Liou-Brennan 模型眼中的性能。在不同的物距下，距离和近焦点的调制传递函数（MTF）以及 MTF 下的面积是评估中使用的优点函数。结果与以前的纯幅度设计获得的结果进行了比较。此外，还在模型眼中对镶嵌物进行了图像模拟，以显示我们的建议在改善近视力质量方面的良好性能。
