Purpose: To determine the degree of corneal thickness variability that may be encountered during routine radial keratotomy (RK) surgery.
Setting: Office refractive surgical suite. Laurel Eye Clinic, Brookville, Pennsylvania.
Methods: This study statistically analyzed variability in corneal thickness measured at the optical zone in 140 consecutive eight-incision RK cases. Pachymetry measurements were assessed at each of the eight circumferential optical zone locations and then evaluated in regard to intra-patient variation by location and inter-patient variation in location thickness patterns. Covariants such as central corneal thickness and differing optical zone size were also analyzed.
Results: Mean corneal thickness (adjusted for optical zone and central thickness) between the three superior locations and the three inferior locations varied by 10 microns. In more than 10% of cases, this adjusted difference was greater than 30 microns. Central corneal thickness and differing optical zone sizes had a significant effect on the results.
Conclusion: Corneal thickness measured at the optical zone during eight-incision RK varied significantly by incision location, bringing into question the notion that one blade depth setting is adequate for all incisions.
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