Francis Sharon M, Koppen Carina, Rozema Jos J
Department of Ophthalmology, Visual Optics Lab Antwerp (VOLANTIS), Faculty of Medicine and Health Sciences, University of Antwerp, Wilrijk, Belgium.
Department of Ophthalmology, Antwerp University Hospital, Edegem, Belgium.
Optom Vis Sci. 2025 Jun 1;102(6):394-399. doi: 10.1097/OPX.0000000000002246. Epub 2025 Apr 11.
Abnormalities or irregularities in the cornea, whether it is from scarring or an ectatic disease like keratoconus can significantly affect vision. Correcting such eyes with rigid gas-permeable (RGP) contact lenses can help regularize the cornea and improve vision. However, some aberrations persist despite wearing the best RGP contact lens correction.
This investigation looks into improving contact lenses by designing a customized mask on the contact lens plane. The image quality of keratoconic eyes can be improved by blocking light rays that stray too far from the best focus using a binary mask.
Corneal tomography and biometry data of 20 keratoconic SyntEyes were generated using a stochastic eye model and the best toric RGP contact lens corrections were calculated and applied to these eyes. Custom MATLAB software was used to perform ray tracing through the eye and determine ray coordinates on the retinal plane. Circular zones with radii of 0.015, 0.025, 0.05, and 0.1 mm were created on the image plane that acted as a virtual pinhole. Finally, masks in four regions were designed to block light rays that did not converge inside these virtual pinholes.
A region 4 mask significantly reduces the average root-mean-square wavefront error from 1.82 ± 0.50 to 0.32 ± 0.06 µm ( t test, p<0.05), while blocking 53.87 ± 4.68% of the incoming light. For masks of regions 3, 2, and 1, the root-mean-square wavefront error increases to 0.51 ± 0.01, 1.25 ± 0.36, and 1.81 ± 0.50 μm, respectively, and the amount of blocked light decreases to 30.35 ± 5.09, 8.49 ± 3.70, and 0.47 ± 0.63%, respectively.
Contact lens masks designed to filter out skewed light rays can increase the image quality in contact lens-corrected keratoconic eyes, but this must be balanced with minimal light loss.
角膜的异常或不规则，无论是由于瘢痕形成还是圆锥角膜等扩张性疾病，都可能显著影响视力。使用硬性透气性（RGP）隐形眼镜矫正此类眼睛有助于使角膜规则化并改善视力。然而，尽管佩戴了最佳的RGP隐形眼镜矫正，一些像差仍然存在。
本研究旨在通过在隐形眼镜平面设计定制面罩来改进隐形眼镜。使用二元面罩阻挡偏离最佳焦点太远的光线，可以提高圆锥角膜眼的图像质量。
使用随机眼模型生成20只圆锥角膜SyntEyes的角膜断层扫描和生物测量数据，并计算最佳复曲面RGP隐形眼镜矫正并应用于这些眼睛。使用自定义MATLAB软件对眼睛进行光线追踪，并确定视网膜平面上的光线坐标。在图像平面上创建半径为0.015、0.025、0.05和0.1毫米的圆形区域，作为虚拟针孔。最后，设计四个区域的面罩来阻挡未在这些虚拟针孔内会聚的光线。
4区面罩可将平均均方根波前误差从1.82±0.50显著降低至0.32±0.06µm（t检验，p<0.05），同时阻挡53.87±4.68%的入射光。对于3区、2区和1区的面罩，均方根波前误差分别增加到0.51±0.01、1.25±0.36和1.81±0.50μm，阻挡的光量分别减少到30.35±5.09、8.49±3.70和0.47±0.63%。
设计用于滤除偏斜光线的隐形眼镜面罩可以提高隐形眼镜矫正的圆锥角膜眼的图像质量，但这必须与最小的光损失相平衡。
