Clinical results in using Phaco emulsification using SRK-2 formula. Is the formula suits Sri Lankan population?
Journal Title: Scholars Journal of Applied Medical Sciences - Year 2015, Vol 3, Issue 9
Abstract
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%. In discussion this study is unique in reporting eyes implanted in the capsular bag by the same surgeon, with preoperative measurements obtained from the same instrumentation by the same method and same technician, using SRK-2 formula for IOL power calculation in eyes with medium axial length that underwent phacoemulsification with foldable IOL implantation. The results support SRK-2 formula as a good option to predict the refractive error after cataract extraction by phacoemulsification in eyes with medium axial length. Keywords: phacoemulsification, eyes, Snellen's chart
Authors and Affiliations
AA Nilanga Nishad, MS Amaratunge, Jayan de Silva, MAJI Mallawarachchi
Keywords
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