DOI: 10.36347/sjams.2015.v03i09.025

Pages: 3272-3274

We wanted to evaluate the predictive accuracy of post operative refraction using SRK-2 formula in phacoemulsification of eyes with 22-26mm axial length. Senile cataract patients who underwent phacoemulsification and in-the-bag implantation of lens (IOL) between January to December 2010 in Gampaha district by a single surgeon were selected randomly. Single examiner measured simulated manual keratometry preoperatively and seven days postoperatively; uncorrected visual acuity, slit lamp examination of the anterior segment and best spectacle-corrected visual acuity (BSCVA) was taken using Snellen's chart. The implanted IOL power was used to calculate predicted postoperative refractive error by SRK-2 formula. The results of the 274 patients, mean (S.D.) age was 65.3(10) years. 56% were females. 90(32.8%) had diabetes mellitus and 107(39%) had hypertension. The right eye was operated in 142 (51.8%) patients and the left eye in 132 (48.2%). All surgeries were uneventful. 7days after surgery, 79% had VA of 6/6 and 14% had 6/9, 4% had 6/12 to 6/36 in the operated eye. Mean (S.D.) IOL power used 21.50D (1.90D). Mean predicted refractive error with SRK-2 -0.300±0.145D. The mean achieved refractive error -0.220±0.732D. Difference between predicted and achieved refractive error presented a slight hyperopic shift (mean ± SD: 0.054±0.397D). There was a negative Pearson correlation (-0.126) between the predicted refractive error and achieved refractive error (p=0.038). Predictive error less than 0.5 in 80.2%, <0.75 in 88.6% and <1.0 in 96.7%.