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Optical Engineering

Interferometric measurement of actual oblique astigmatism of ophthalmic lenses
Author(s): Erning Wihardjo
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Paper 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.

Paper Details

Date Published: 1 March 1995
PDF: 5 pages
Opt. Eng. 34(3) doi: 10.1117/12.190404
Published in: Optical Engineering Volume 34, Issue 3
Show Author Affiliations
Erning Wihardjo, Polycore Optical Pte. Ltd. (Singapore)


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