Poster + Paper
1 October 2024 Design of ophthalmic contact lens using Q-type aspheres with reduced error budget for high visual acuity
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Conference Poster
Abstract
This paper investigates the design of an ophthalmic rigid Contact Lens (CL) that has a Q-type aspheric surface to reduce the tolerance error budget and produce higher visual acuity. CLs for myopia correction are typically made with spherical surfaces; when such CLs are worn in darkness, the visual acuity degrades severely due to the spherical aberration generated by pupil dilation. To maximize visual acuity, an aspheric CL is essential because it can correct the spherical aberration. In this study, a CL is designed based on a schematic eye model for evaluating the Modulation Transfer Function (MTF) on the retina, and the result shows that the visual acuity produced by an aspheric CL is superior to that produced by a spherical CL. The traditional power-series polynomial is commonly used for aspheric surface design, but the aspheric slope cannot be controlled during optimization. The large slope departure from a best-fit sphere leads to high tolerance sensitivity and an inflection point; however, the CL does not permit such results. To solve this problem, the Q-type polynomial with slope constraint proposed by Forbes is applied to the aspheric CL in this study. The Q-type aspheric polynomial can not only enhance the optimization efficiency due to its orthogonal characteristics, but also reduce error budget for maximal manufacturing yield. The simulation results demonstrated that the spherical aberration is successfully reduced by the Q-type aspheric CL for better visual acuity in darkness.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Wei-Jei Peng and Tsung-Xian Lee "Design of ophthalmic contact lens using Q-type aspheres with reduced error budget for high visual acuity", Proc. SPIE 13131, Current Developments in Lens Design and Optical Engineering XXV, 131310I (1 October 2024); https://doi.org/10.1117/12.3029077
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KEYWORDS
Aspheric lenses

Modulation transfer functions

Eye models

Contact lenses

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