Dr. Vanathi M, V07265, Dr. (Mrs) Radhika Tandon, Dr. Nikhil Kuthirummal
Objective: To evaluate Barrett Universal II (BU II) IOL power calculation formula
Methodology: Prospective Observational Study of patients of phacoemulsification for demography, biometry, IOL power, postoperative refraction. Predicted refractive outcome by four IOL formulas (modified SRK II, SRK/T, Olsen, BU II), actual refractive outcome & mean absolute error (MAE) in predicted refraction calculated; data analysed in 3 groups [AL < 22.0 mm, 22.0 – 24.5 mm, > 24.5 mm].
Results: In 244 patients (mean age 60.2 ± 9.8 years), BU II formula had lowest MAE (p value < 0.0005). There was a statistically significant difference between MAE by modified SRK II, SRK/T and Barrett Universal II formulas (p value < 0.0005). Percentage of eyes with prediction errors within ± 0.5D (71.07%) & ± 1.0D (97.97%) of target refraction was highest with BU II
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