Sagitta of ophthalmic lenses

Purpose To propose alternative formulas for the sagitta calculation of ophthalmic lenses. Methods Equation factoring. Results The conventional sagitta formula is algebraically inconsistent when applied to curves with direction‐oriented radii. It is possible to correct this problem by factoring it. C...

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Bibliographic Details
Published in:Ophthalmic & physiological optics 2020-11, Vol.40 (6), p.828-829
Main Author: Faria‐e‐Sousa, Sidney Julio
Format: Article
Language:English
Subjects:
lens thickness
ophthalmic lenses
sag
sagitta
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Summary:Purpose To propose alternative formulas for the sagitta calculation of ophthalmic lenses. Methods Equation factoring. Results The conventional sagitta formula is algebraically inconsistent when applied to curves with direction‐oriented radii. It is possible to correct this problem by factoring it. Conclusions The conventional sagitta formula can and should be replaced by unambiguous equations.
ISSN:0275-5408
1475-1313
DOI:10.1111/opo.12732