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Derivation of corneal flattening factor, p ‐value
Author(s) -
Lam Andrew K. C.,
Douthwaite William A.
Publication year - 1994
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/j.1475-1313.1994.tb00136.x
Subject(s) - keratometer , flattening , radius , value (mathematics) , mathematics , corneal topography , optics , cornea , physics , ophthalmology , medicine , statistics , computer science , computer security , astronomy
A mathematical equation was, derived to calculate the corneal p ‐value based on the central and peripheral corneal radii and the corresponding semichord diameters. The calculation was simplified by a computer program written using GWBASIC. The accuracy of corneal p ‐value generated from this program was checked with Douthwaite's modified keratometer with good correlation. This program could be used lo find out the corneal p‐value and apical radius r o for any topographic keratometer which only provides central and peripheral radii without any information of the p ‐value and apical radius.