18 November 2013 Sphere power measuring in ophthalmic lenses by infinite fringe moiré deflectometry
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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785D0 (2013) https://doi.org/10.1117/12.2022246
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal
Abstract
We present a method to measure spherical power in ophthalmic lenses based on the measurement of moiré patterns, using the technique called infinite fringe moiré deflectometry. We develop a theoretical model using a geometrical analysis that was validated by a computer simulation using the LabVIEW software; also we build an experimental setup in which we get experimental data. As results, we obtain a measurement of the spherical power of a set of ophthalmic test lenses in the range of ± 0.50 to ± 3.00 diopters. This power is obtained by measuring the separation between each fringe of moiré pattern, from the obtained data we analyze the theoretical model and we make the necessary corrections, using polynomial regression by the method of least squares, to comply with standard ISO8598. At the same time, some components of the experimental setup were being improved to facilitate its implementation and obtain better experimental data.
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Jorge A. García-Ruelas, Gerardo Trujillo-Schiaffino, Didia P. Salas-Peimbert, Marcelino Anguiano-Morales, Luis F. Corral-Martinez, "Sphere power measuring in ophthalmic lenses by infinite fringe moiré deflectometry", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785D0 (18 November 2013); doi: 10.1117/12.2022246; https://doi.org/10.1117/12.2022246
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