Faculty of Science and Technology, Keio University, Kawasaki, Kanagawa 212-0032, Japan.
ACS Appl Mater Interfaces. 2009 Apr;1(4):907-12. doi: 10.1021/am900017r.
In this research, we propose to reduce astigmatism and distortion in a progressive addition lens (PAL) by employing a polymer-based graded-index (GRIN) material. We adopted the diffusion copolymerization method for the GRIN-PAL fabrication. The GRIN material was prepared by partial diffusion of methyl methacrylate (MMA) and 2,2,2-trifluoroethyl methacrylate (3FMA) monomers into the cross-linked benzyl methacrylate polymer gel. GRIN-PAL was prepared by polymerization of the GRIN material in a mold of commercially available PAL. As a result, methods to control Deltan, the diffusion length, and the order of the GRIN profile in polymeric GRIN materials were demonstrated. In a combination of the PBzMA gel and the MMA/3FMA diffusion monomer, 50/50 in volume provides the highest Deltan. The diffusion period mainly affects the diffusion length. These two parameters consequently determine the order of the GRIN profile and the focusing power that the GRIN provides. The difference in the ease of diffusion caused by the difference in the cross-linking density provides a method for positional control of the GRIN profile. Furthermore, GRIN-PAL using a polymeric material was successfully fabricated. Improvement in astigmatism and distortion was demonstrated using GRIN. Therefore, the GRIN material is suggested to be applicable for the further modification of the PAL with low astigmatism and distortion.
在这项研究中，我们建议通过使用基于聚合物的渐变折射率 (GRIN) 材料来减少渐进式附加透镜 (PAL) 中的像散和失真。我们采用扩散共聚法来制造 GRIN-PAL。GRIN 材料是通过甲基丙烯酸甲酯 (MMA) 和 2,2,2-三氟乙基甲基丙烯酸酯 (3FMA) 单体的部分扩散到交联的苯甲基甲基丙烯酸酯聚合物凝胶中制备的。GRIN-PAL 通过在市售的 PAL 模具中聚合 GRIN 材料来制备。结果，展示了控制聚合物 GRIN 材料中的 Deltan、扩散长度和 GRIN 轮廓阶数的方法。在 PBzMA 凝胶和 MMA/3FMA 扩散单体的组合中，按体积 50/50 提供了最高的 Deltan。扩散期主要影响扩散长度。这两个参数决定了 GRIN 轮廓的阶数和 GRIN 提供的聚焦能力。交联密度差异导致的扩散难易程度的差异为 GRIN 轮廓的位置控制提供了一种方法。此外，成功地制造了使用聚合物材料的 GRIN-PAL。通过使用 GRIN 显示了像散和失真的改善。因此，建议将 GRIN 材料应用于具有低像散和失真的 PAL 的进一步改进。
