Sagitta of ophthalmic lenses

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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Veröffentlicht in:Ophthalmic & physiological optics 2020-11, Vol.40 (6), p.828-829
1. Verfasser: Faria‐e‐Sousa, Sidney Julio
Format: Artikel
Sprache:eng
Schlagworte:
lens thickness
ophthalmic lenses
sag
sagitta
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Zusammenfassung: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