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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 12, Iss. 8 — Aug. 1, 1995
  • pp: 1647–1656

Geometrical theory to predict eccentric photorefraction intensity profiles in the human eye

Austin Roorda, Melanie C. W. Campbell, and W. R. Bobier  »View Author Affiliations


JOSA A, Vol. 12, Issue 8, pp. 1647-1656 (1995)
http://dx.doi.org/10.1364/JOSAA.12.001647


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Abstract

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.

© 1995 Optical Society of America

History
Original Manuscript: March 30, 1994
Revised Manuscript: September 6, 1994
Manuscript Accepted: October 3, 1994
Published: August 1, 1995

Citation
Austin Roorda, W. R. Bobier, and Melanie C. W. Campbell, "Geometrical theory to predict eccentric photorefraction intensity profiles in the human eye," J. Opt. Soc. Am. A 12, 1647-1656 (1995)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-12-8-1647


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