June 28, 2013
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Revised nomogram enhances IOL power calculation after previous LASIK

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An updated nomogram enabled accurate prediction of refractive error in eyes undergoing cataract surgery after LASIK, according to a study.

The study authors evaluated the Diehl-Miller nomogram in a new group of eyes rather than the eyes that provided input for the original formula.

The prospective study included 23 eyes of 18 patients who underwent cataract surgery and IOL implantation after previous LASIK. The mean time between LASIK and cataract surgery was 108 months.

Investigators used IOL power data and post-LASIK refractive data to calculate target refractive error that would achieve emmetropia and devised a refined equation based on those data.

Calculated target refractive error varied from true target refractive error by an absolute mean of 0.48 D. Calculated target refractive error was within 0.5 D of the true target in 49% of patients and within 1 D in 93%.

Calculated mean target refractive error was –0.94 D. Mean achieved postoperative spherical equivalent error was –0.18 D.

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