American Journal of Ophthalmology AJO 02 320 R 1 Page 5
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the refraction-derived method; this method is useful when the pre-Lasik K readings are
not available but the amount of refractive correction is known. The other method to
obtain a corrected keratometric value (Kc.cd) is based on clinical findings; this clinically-
derived method uses a regression equation to modify the measured post-Lasik K readings
and requires neither the pre-Lasik K readings nor the amount of myopic correction
achieved by the refractive surgery. It can be used when these refractive parameters are
not available.
The second purpose of this study is to calculate Kc.rd and Kc.cd in a second
group of 100 consecutive Lasik cases, and to compare the results to the keratometric
values obtained by the history-derived method (Kc.hd).
