Abstract

Eccentric photorefraction usually is used as early eyesight diagnostic test of infants and small children. Unlike currently approved geometrical optical model of eccentric photorefractometer, the crescent formation and the light-intensity distribution in the pupil image of a myopic eye are analyzed by Fourier optics with the assumption of an isotropic scattering retina. In the case of little circular light source and rectangular slit, the simulation results of different myopic diopters are obtained by geometrical optical theory and Fourier optics respectively. It is found that the simulation results by Fourier optics are similar as those obtained by geometrical optics, and all simulations are almost corresponding to the experimental result. The result demonstrates that the new method presented here is feasible.

© 2007 Chinese Optics Letters

Light-intensity distribution in eccentric photorefraction crescents

Reinhard Kusel, Ulrich Oechsner, Wolfgang Wesemann, Stephan Russlies, Eva M. Irmer, and Bernhard Rassow
J. Opt. Soc. Am. A 15(6) 1500-1511 (1998)

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

Austin Roorda, Melanie C. W. Campbell, and W. R. Bobier
J. Opt. Soc. Am. A 12(8) 1647-1656 (1995)

Simulation of eccentric photorefraction images

Ying-Ling Chen, Bo Tan, and J. W. L. Lewis
Opt. Express 11(14) 1628-1642 (2003)

Theory of eccentric photorefraction (photoretinoscopy): astigmatic eyes

Wolfgang Wesemann, Anthony M. Norcia, and Dale Allen
J. Opt. Soc. Am. A 8(12) 2038-2047 (1991)

Slope-based eccentric photorefraction: theoretical analysis of different light source configurations and effects of ocular aberrations

Austin Roorda, Melanie C. W. Campbell, and William R. Bobier
J. Opt. Soc. Am. A 14(10) 2547-2556 (1997)