矫正近视和老视的非球面衍射型隐形眼镜

近视人眼随年龄的增长会出现老视, 为了实现一副眼镜矫正近视并发老视人眼的远、近视力, 设计了一种非球面衍射型隐形眼镜(CL), 通过非球面CL矫正近视, 并通过衍射环的设计矫正老视。在一个有200度近视和2 D调节力的近视并发老视眼模型上优化CL, 选取的5个设计物距介于250 mm到无限远。研究了0°视场和±4°视场时设计物距下佩戴CL的近视并发老视眼模型的光学性能。结果表明, 佩戴该CL后, 在明视觉条件下(2.8 mm瞳孔直径), 注视不同距离物体时, 人眼视力最低可达1.3, 最高可达1.5; 在间视觉条件下(4.5 mm瞳孔直径), 除注视无穷远处物体时视力略差(0.9), 注视其他距离物体时, 视力均在1.0以上。此外, 佩戴CL后, 眼模型的大视场彗差、像散和畸变均在合理范围内。可见, 所设计CL能够在0~4 D物距范围内提供良好的光学质量和视觉质量, 且中间距离也实现了高质量成像, 成像性能几乎不受瞳孔变化的影响。

Abstract

The myopia will suffer presbyopia with aging. A diffractive aspheric contact lens (CL) is designed, aiming to correct myopic-presbyopia with a pair of glasses. In this design, myopia is corrected by the aspheric surface of the CL and presbyopia is corrected by the diffractive rings. The CL is optimized based on a myopic-presbyopia eye model considering 2.00 diopters of myopia and an accommodation of 2 D. Five object locations covering a range from infinity to 250 mm are considered. The optical properties of the myopic-presbyopia eye model with CL of 0° and ±4° field of view are researched. As a result, with the CL, the visual acuity looking at different locations are in a range from 1.3 to 1.5 in photopic vision (2.8 mm pupil diameter), except slightly worse infinity visual acuity (0.9), and the visual acuity looking at different locations remains above 1.0 in mesopic vision (4.5 mm pupil diameter). Additionally, the aberrations, such as coma, astigmatism and distortion, of the central visual field are reasonable after CL is worn. Therefore, the designed CL provides high optical performance and visual performance for myopic-presbyopia at 0 D and 4 D as well as high optical performance at intermediate distances, and the imaging performance is almost unaffected by the pupil.

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姜来, 刘永基, 王晓琳, 王肇圻. 矫正近视和老视的非球面衍射型隐形眼镜[J]. 光学学报, 2017, 37(1): 0122003. Jiang Lai, Liu Yongji, Wang Xiaolin, Wang Zhaoqi. Diffractive Aspheric Contact Lens to Correct Myopic-Presbyopia[J]. Acta Optica Sinica, 2017, 37(1): 0122003.

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