Interferometric measurement of actual oblique astigmatism of ophthalmic lenses

Erning Wihardjo

doi:10.1117/12.190404

1 March 1995 Interferometric measurement of actual oblique astigmatism of ophthalmic lenses

Erning Wihardjo

Author Affiliations +

Optical Engineering, Vol. 34, Issue 3, (March 1995). https://doi.org/10.1117/12.190404

Abstract

A technique for measuring oblique astigmatism error of ophthalmic lenses is described. The technique is based on a Mach-Zehnder interferometer, which allows us to simulate the actual conditions of the eye. The effects of the lens power, the pupilary aperture size and the viewing distance in calculating a projected pupil zone on the lens are discussed. The projected pupil size on the lens affects the measurement result of the oblique astigmatism error. Conversion of the interferogram to astigmatism error in diopters is given.

Citation Download Citation

Erning Wihardjo "Interferometric measurement of actual oblique astigmatism of ophthalmic lenses," Optical Engineering 34(3), (1 March 1995). https://doi.org/10.1117/12.190404

Published: 1 March 1995

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