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Sagitta of ophthalmic lenses
Author(s) -
FariaeSousa Sidney Julio
Publication year - 2020
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/opo.12732
Subject(s) - sagitta , factoring , mathematics , physics , mathematical analysis , finance , fishery , fish <actinopterygii> , otolith , economics , biology
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.