Comparison of the Accuracy of Computerized Videokeratography and Keratometry for Use in the SRK II Formula for Lens Calculations

OBJECTIVE: Accuracy comparison of computerized videokeratopraphy and keratometry for use in the SRK II formula for lens calculations. STUDY DESIGN: Preoperative biometry on 46 eyes undergoing phacoemulsification using either the keratometric equivalent derived from the Eyesys Corneal Analysis System™ (ECAS) or standard keratometry. The SRK II formula was used for the lens calculations. The patients were refracted 3 months postoperatively and the difference between the predicted refraction and the actual refraction was determined. RESULTS: Use of the ECAS resulted in smaller mean errors, but not to a significant degree. The ECAS however, produced a significantly greater proportion of actual refractions within 0.5 D of the predicted refraction.