American Journal of Ophthalmology AJO 02 320 R 1 Page 3
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RESULTS: We used Kc.hd as the benchmark. Both Kc.rd and Kc.cd values correlated
highly with Kc.hd when plotted on a scattergram (P<0.001) and there was no statistically
significant difference between the mean keratometric values (P>0.5).
CONCLUSIONS: The corneal power measurements for IOL power calculations after
Lasik need to be corrected to avoid hypermetropia after cataract surgery. The history-
derived method is the standard and requires knowledge of the pre-Lasik K readings and
of the amount of myopia corrected. The refraction-derived method can be used if the
amount of myopic correction is known whether or not the pre-Lasik K readings are
available. The clinically-derived method depends only on the post-Lasik K readings and
can be used when neither the pre-Lasik K readings nor the amount of myopia corrected
are available.
