ArticleTurkish journal of ophthalmology2025
Evaluating the Predictive Accuracy of the Kane and SRK/T Formulas in Keratoconus Patients Undergoing Cataract Surgery.
Article in Turkish journal of ophthalmology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Objectives: To compare the predictive performance of the SRK/T and Kane formulas in eyes with keratoconus undergoing cataract surgery. Materials and Methods: A consecutive series of keratoconic eyes that underwent cataract surgery were retrospectively analyzed. Intraocular lens power was calculated using the SRK/T and Kane Keratoconus formulas. Subjective refraction was evaluated 1 month postoperatively. The mean prediction error (MPE) and percentage of eyes with a prediction error within ±0.50 diopters (D) and ±1.00 D were calculated. Patients were divided into two categories: early-stage (stage 1) and advanced-stage (stage 2-3) keratoconus. Results: Thirty eyes of 25 patients were included in the study. A comparison of MPE between the two formulas in the stage 1 keratoconus group revealed no statistical difference. However, the MPE for the SRK/T formula was found to be significantly higher (p=0.005) in the stage 2-3 group. In the stage 1 group, 84.6% of eyes were within the PE range of ±1.00 D based on the Kane formula, while 76.9% of eyes fell within the ±1.00 D range according to the SRK/T formula. In stage 2-3 group, 41.2% of eyes were within the PE range of ±1.00 D based on the Kane formula, while 29.4% of eyes fell within the ±1.00 D range according to the SRK/T formula. Conclusion: A comparison of the two formulas showed no statistically significant differences in early-stage keratoconus. However, in advanced keratoconus cases, the Kane formula exhibited superior accuracy.
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