Optical analysis for light intensity distribution in EPR with different light sources

Xiangning Li; Liner Zou; Longyun Xu; Jiabi Chen; Yi Wang

doi:10.1117/12.471197

20 September 2002 Optical Analysis for Light Intensity Distribution in EPR with Different Light Sources

Xiangning Li, Liner Zou, Longyun Xu, Jiabi Chen, Yi Wang

Proceedings Volume 4927, Optical Design and Testing; (2002) https://doi.org/10.1117/12.471197
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Eccentric photorefraction is an objective refraction technique that, by taking a picture of the pupil of the subject, can measure refractive errors in human eyes. The method assessing the refractive errors is mainly from the size and orientation of the crescent of the pupil image. Because of the effects of the light source and the vignetting of the optical system’s aperture, the boundary of the crescent is not sharp so as to accurately determine its size. This uncertainty reduces the accuracy of the EPR system and limits its extensive application. In this paper, analysis on the light intensity distribution across the pupil is presented. It aims to determine the size of the crescent based on the aperture opening in the form of straight edge, rectangle and slit are also included in discussion. The analysis shows that the EPR system with a line source and a rectangular aperture opening will give a good linear light distribution profile across the pupil, which may be helpful to automatically determine the size of the crescent. The method will effectively improve the measurement accuracy of EPR.

Citation Download Citation

Xiangning Li, Liner Zou, Longyun Xu, Jiabi Chen, and Yi Wang "Optical Analysis for Light Intensity Distribution in EPR with Different Light Sources", Proc. SPIE 4927, Optical Design and Testing, (20 September 2002); https://doi.org/10.1117/12.471197

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KEYWORDS

Light sources

Cameras

Light

Eye

Optical analysis

Photorefraction

Retina

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