GEOMETRICAL-THEORY TO PREDICT ECCENTRIC PHOTOREFRACTION INTENSITY PROFILES IN THE HUMAN EYE

被引:28
作者
ROORDA, A
CAMPBELL, MCW
BOBIER, WR
机构
[1] UNIV WATERLOO, DEPT PHYS, WATERLOO, ON N2L 3G1, CANADA
[2] UNIV WATERLOO, GUELPH WATERLOO PROGRAM GRAD WORK PHYS, WATERLOO, ON N2L 3G1, CANADA
关键词
ECCENTRIC PHOTOREFRACTION; OCULAR ABERRATIONS; RETINAL REFLECTIONS;
D O I
10.1364/JOSAA.12.001647
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In eccentric photorefraction, light returning from the retina of the eye is photographed by a camera focused on the eye's pupil. We use a geometrical model of eccentric photorefraction to generate intensity profiles across the pupil image. The intensity profiles for three different monochromatic aberration functions induced in a single eye are predicted and show good agreement with the measured eccentric photorefraction intensity profiles. A directional reflection from the retina is incorporated into the calculation. Intensity profiles for symmetric and asymmetric aberrations are generated and measured. The latter profile shows a dependency on the source position and the meridian. The magnitude of the effect of thresholding on measured pattern extents is predicted. Monochromatic aberrations in human eyes will cause deviations in the eccentric photorefraction measurements from traditional crescents caused by defocus and may cause misdiagnoses of ametropia or anisometropia. Our results suggest that measuring refraction along the vertical meridian is preferred for screening studies with the eccentric photorefractor.
引用
收藏
页码:1647 / 1656
页数:10
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