Abstract
Aim: to evaluate the biometric factors that influence the refraction obtained after simple phacoemulsification using the SRK/T formula. Methods: This is a prospective study of 86 eyes subjected to cataract surgery during a one-year period. The biometric factors evaluated include axial length, keratometry, lens thickness, anterior chamber depth and vitreous depth. The implant calculation formula employed was SRK/T, which is a commonly used method. All patients underwent phacoemulsification and implantation of a foldable intraocular lens into the capsular bag. Refraction was measured 30 days after surgery. Results: the mean axial length was 23.16±0.53mm, mean K1 was 43.5±1.50D, mean K2 was 43±1.63D, mean anterior chamber depth was 3.03mm, mean lens thickness was 3.37mm, mean postoperative target refraction was 0.16±0.377D, and mean postoperative refraction obtained was -0.226±0.625D. Among the eyes, 18.92% had a postoperative refraction within ±0.5D, and a non-target refraction outside ±0.5D was found in 64 eyes. In addition, 30.23% of the eyes had a postoperative refraction within ±0.75D. Conclusion: the SRK/T formula seems to be a dependable method for predicting postoperative refraction following cataract surgery. However, the accuracy of this prediction may be influenced by the axial length of the eye. Higher axial lengths are associated with a greater tendency towards myopia.
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