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Application of a modified keratometer in the study of corneal topography on Chinese subjects
Author(s) -
Lam Andrew K. C.,
Douthwaite William A.
Publication year - 1996
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.1475-1313.1996.95000151.x
Subject(s) - meridian (astronomy) , keratometer , ophthalmology , cornea , geodesy , significant difference , corneal topography , correlation coefficient , medicine , optics , geology , mathematics , physics , statistics , astronomy
Summary A corneal topography study was carried out on Hong Kong Chinese subjects using a modified keratometer. The Chinese corneal topography measured by this modified keratometer was similar to other studies using the Wesley–Jessen Photo Electronic Keratoscopy (PEK) System 2000. The mean p ‐values along the horizontal meridian and the vertical meridian were 0.82 and 0.87, respectively. A negative correlation was found between the p ‐value and the central corneal radius along the horizontal meridian which may indicate that a steeper central cornea will have a greater p ‐value. However, the correlation coefficient of 0.56 was not too certain for this conclusion to be drawn. A difference of 0.04 was found between the horizontal p ‐value and the vertical p ‐value, which may be a result of the tight lid tension along the vertical meridian. This modified keratometer can be considered as an inexpensive instrument for the study of corneal topography.