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To determine the difference between the predictive ability of SRK-T and SRK-II formulae in IOL power calculation for aspheric and non aspheric IOL types, retrospective analysis of case sheets of 70 patients who underwent phacoemulsification at a tertiary care centre was done. Pre-operative measurements of axial length, keratometry and IOL power calculation with optimised A constant, done by a single operating surgeon manually, was used in this assessment. All patients underwent phacoemulsification with intraocular lens (IOL) implantation into the bag done by a single experienced surgeon. Aspheric IOL was implanted in 35 patients and non-aspheric IOL in rest of the 35 patients. Post operative refraction was done at 4-6 weeks and the spherical equivalent obtained was compared with the predictive error noted preoperatively using the SRK-T and SRK-II formulae. Using SRK-T formula the absolute error was <0.5D in 51.4% and 45.8% eyes in aspheric and nonaspheric groups respectively. It was <1.0D in 82.85% and 85.71% eyes in aspheric and non-aspheric groups respectively. Using SRK-II formula the absolute error was <0.5D in 40.0% and 42.8% eyes in aspheric and non-aspheric cases respectively. It was <1.0D in 74.28% and 80.0% eyes in aspheric and non-aspheric groups respectively. No significant difference was observed between the predictive ability of SRK-T and SRK-II formulae for aspheric and non aspheric IOLs.

Predictive Ability of SRK-T and SRK-II Formulae for Aspheric and Non-Aspheric Intraocular Lenses: A Comparative Analysis