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Proceedings Paper

Application of a deflectometry method to deep aspheric ophthalmic surface testing
Author(s): Gilles Garcin; Christophe Lafay; Gilles Le Saux; Xavier Lippens; Denis Mazuet
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Paper Abstract

Optical surfaces control poses a specific problem in the case of ophthalmic surfaces, particularly for progressive addition surfaces. Usual interferometry methods do not allow to measure easily such measurements but the duration and the sophisticated environment needed increase too much the testing cost. For that purpose, we have developed and patented a progressive addition surface measurement system using a deflectometry method. THe Ronchi method we use consists in illuminating the simple by a known wavefront and in measuring the slopes of the reflected rays. The main issue is then to compute accurately the surface topography. To solve this problem, we use an optimization method. Finally, the built instrument allows us to measure automatically deep aspheric surfaces in a few minutes with an accuracy close to 0.2 percent of its asphericity. It doesn't need a controlled environment.

Paper Details

Date Published: 6 September 1999
PDF: 5 pages
Proc. SPIE 3739, Optical Fabrication and Testing, (6 September 1999); doi: 10.1117/12.360156
Show Author Affiliations
Gilles Garcin, Essilor International (France)
Christophe Lafay, Essilor International (France)
Gilles Le Saux, Essilor International (France)
Xavier Lippens, Essilor International (France)
Denis Mazuet, Essilor International (France)

Published in SPIE Proceedings Vol. 3739:
Optical Fabrication and Testing
Roland Geyl; Jonathan Maxwell, Editor(s)

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