The Effect of Different Radial Keratotomy Patterns on Astigmatism in Rabbits

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Abstract
Standard eight cut radial keratotomy (RK) and five modified incision patterns were evaluated in the rabbit cornea for effectiveness in the correction of astigmatism. Preoperative and postoperative keratometry readings snowed that the least effective patterns consisted of standard RK with an oval central optical zone or parallel double radial cuts at the steepest meridian; average corrections were 0.33 diopter and 0.46 diopter respectively, These results were not significantly different from the results with standard RK of eight radial incisions and a circular optical zone. The combination of these two patterns, as well as a single transverse cut added to the standard pattern, showed moderate effectiveness, 1.0 diopter and 1.38 diopter respectively. Double transverse cuts at the steepest meridian yielded the largest correction, up to 2.08 diopters. This study indicates that different RK patterns achieve different amounts of astigmatic correction. Suitable patterns for correcting different degrees of astigmatism may be selected by the surgeon, depending on the degree of correction required.

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