No-history method of intraocular lens power calculation for cataract surgery after myopic laser in situ keratomileusis

Purpose

To prospectively evaluate the no-history method for intraocular lens (IOL) power calculation in 15 cataractous eyes that had previous myopic laser in situ keratomileusis (LASIK) and for which the pre-LASIK K-readings were not available.

Setting

Private practice, Lynwood, California, USA.

Methods

The predicted IOL power was calculated in each case. Also calculated were the mean arithmetic and absolute IOL predictor errors, range of the prediction errors, and number of eyes in which the error was within ±1.00 diopter (D).

Results

The mean arithmetic IOL prediction error was −0.003 D ± 0.63 (SD), and the mean absolute IOL prediction error was 0.55 ± 0.31 D (range −0.89 to +1.05 D). Fourteen eyes (93.3%) were within ±1.00 D. The results of the Shammas post-LASIK formula compared favorably to the results obtained with the optimized Holladay 1 (P = .42), Hoffer Q (P = .25), Haigis (P = .30), and Holladay 2 (P = .19) formulas and were better than the results obtained with the optimized SRK/T formula (P = .0005).

Conclusion

The no-history method is a viable alternative for IOL power calculation after myopic LASIK when the refractive surgery data are not available.