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A pilot study on the measurement of central posterior corneal radius in Hong Kong Chinese using Purkinje image technique
Author(s) -
Lam Andrew K. C.,
Douthwaite William A.
Publication year - 1997
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 - 10.1046/j.1475-1313.1997.96000427.x
Subject(s) - optometry , ophthalmology , radius , optics , medicine , physics , computer science , computer security
Summary The central posterior corneal radius was measured by assessing the first and second Purkinje images produced from a modified kefatometer. This method was initially assessed by measuring five PMMA lens buttons with back surface radii from 6.2 mm to 7.0 mm. It was reasonably accurate when compared with the measurements made using a conventional radiuscope. The technique was found to be repeatable for human subjects measured on three separate occasions. The mean central posterior corneal radii from a group of 30 Hong Kong Chinese were 6.64 mm (SE 0.05 mm) and 6.39 mm (SE 0.05 mm) along the horizontal and vertical meridians respectively. These results are similar to previous studies using a similar technique. The posterior corneal radii were found to be similar for right and left eyes and there were no gender differences.