Compartive Accuracy of the SRK II, SRK/T and Holladay Formulas for Intraocular Lens Power Calculation in Severe Myopic Eyes

Kang, Kyoung Bok; Lee, Jin Hak

Abstract

The predictive accuracy of the SRK II, SRK/T and Holladay formulas was evaluated in 22 eyes with sever myopia who had phacoemulsification and implantaton of posterior chamber IOL without suture. These patients were followed up for at least 6 months postoperatively. Correlation coefficient between the predicted refraction and actual refraction was 0.57(P<0.01) in the eyes using the SRK/T, 0.566(P<0.01) in the Holladay and (0.06(P=0.791) in the SRK II. The mean absolute error in the SRK/T 0.85 was smaller than that of the Holladay 1.04 and the SRK II1.08(p<0.05). The percentage of the eyes with absolute error within 1D was 68% in the SRK/T, 68% in the Holladay and 53% in the SRK II, but there was no statistically significant difference between them(p>0.05). The percentage of the eye with hyperopic shift(more hyperopic actual refraction than the predicted refraction) was 77% in the SRK II, 77% in the SRK/T and 86% in the Holladay, but there was no statistically significant difference between each formula(p>0.05). In conclusion, the SRK/T has the better predictive accuracy than the SRK II and Holladay in severe myopia and hyperopic shift tends to occur with the application of all three formulas.