A
Study of Axial Length, Keratometry, and the Predictability of SRK Formula
in Intraocular Lens Power Calculation in Southern Thai Patients
Prut
Hanutsaha, M.D.,
Visootr Chayakul, M.D., Dr. Med.
Department of
Ophthalmology, Faculty of Medicine, Songklanagarind Hospital Prince of Songkla
University Haadyai 90110
ABSTRACT The
three hundred thirty one patients (378 eyes) underwent cataract extraction
and posterior chamber lens implantation in Songklanagarind Hospital from January
1, 1986 to December 31, 1987 was retrospectively studied. The mean values
of the keratometry in females were 45.00 diopter and 43.99 diopter in males,
and were statistical significant difference (P = 2.60 x loll).
The axial length in males
(23.55mm.) and females (22.92 mm.) were also statistical significant difference
(P = 3.82 x 1012). Vision by calculation from the SRK formula is 64 percent
within +1-1 diopter. However, if we calculate with the new formula which is
adapted for Thai patients, the vision is 72 percent within +1-1 diopter. But
in the cases that we can not calculate the in traocular lens power, we can
use +17.5 diopter as the standard intraocular lens power, the result
of the vision is 48 percent within +1-1 dioper.
Thai
J Ophthalmol 1990; July - Dec 4 (2): 109-117
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