Contact lens design with slope-constrained Q-type aspheres for myopia correction

Wei-Jei Peng; Yuan-Chieh Cheng; Wei-Yao Hsu; Zong-Ru Yu; Cheng-Fang Ho; Khaled Abou-El-Hossein

doi:10.1117/12.2273520

23 August 2017 Contact lens design with slope-constrained Q-type aspheres for myopia correction

Wei-Jei Peng, Yuan-Chieh Cheng, Wei-Yao Hsu, Zong-Ru Yu, Cheng-Fang Ho, Khaled Abou-El-Hossein

Proceedings Volume 10375, Current Developments in Lens Design and Optical Engineering XVIII; 103750T (2017) https://doi.org/10.1117/12.2273520
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

The design of the rigid contact lens (CL) with slope-constrained Q-type aspheres for myopia correction is presented in this paper. The spherical CL is the most common type for myopia correction, however the spherical aberration (SA) caused from the pupil dilation in dark leads to the degradation of visual acuity which cannot be corrected by spherical surface. The spherical and aspheric CLs are designed respectively based on Liou’s schematic eye model, and the criterion is the modulation transfer function (MTF) at the frequency of 100 line pair per mm, which corresponds to the normal vision of one arc-minute. After optimization, the MTF of the aspheric design is superior to that of the spherical design, because the aspheric surface corrects the SA for improving the visual acuity in dark. For avoiding the scratch caused from the contact profilometer, the aspheric surface is designed to match the measurability of the interferometer. The Q-type aspheric surface is employed to constrain the root-mean-square (rms) slope of the departure from a best-fit sphere directly, because the fringe density is limited by the interferometer. The maximum sag departure from a best-fit sphere is also controlled according to the measurability of the aspheric stitching interferometer (ASI). The inflection point is removed during optimization for measurability and appearance. In this study, the aspheric CL is successfully designed with Q-type aspheres for the measurability of the interferometer. It not only corrects the myopia but also eliminates the SA for improving the visual acuity in dark based on the schematic eye model.

Conference Presentation

Citation Download Citation

Wei-Jei Peng, Yuan-Chieh Cheng, Wei-Yao Hsu, Zong-Ru Yu, Cheng-Fang Ho, and Khaled Abou-El-Hossein "Contact lens design with slope-constrained Q-type aspheres for myopia correction", Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 103750T (23 August 2017); https://doi.org/10.1117/12.2273520

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available