Prediction of refractive correction with radial keratotomy.

Multiple regression analysis was employed to estimate the amount of preoperative correction required to achieve emmetropia in 129 spherical radial keratotomy procedures. Age, intraocular pressure, central corneal thickness, number of incisions, number of zones, and central optical zone size are variables that describe the amount of refractive correction required in order to achieve emmetropia. The surgical procedures from which these estimates are derived yield meaningful reductions in myopia. Recommendations for further research on the prediction of optimal response to radial keratotomy are included.