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Study outlines five of the top corneal power adjustment techniques

Am J Ophthalmol. 2011;118(5):940-944.

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A study identified the top five corneal power adjustment techniques in terms of mean prediction errors, standard deviations and minimizing hyperopic refractive surprises.

Of 25 formula combinations tested, the five most accurate predicted between 70% and 85% of eyes within 1 D of target refraction, the study authors said.

The five techniques were Masket with the Hoffer Q formula, Shammas.cd with the Shammas-PL formula, Haigis-L, clinical history method with the Hoffer Q, and Latkany Flat-K with the SRK/T.

The retrospective study included 173 eyes of 117 patients. Of those eyes, 89 underwent LASIK and 84 underwent PRK for myopia and subsequent cataract surgery. Data were collected from patients' charts.

Using the top five methods, visual outcomes within 1 D of target refraction were greater than when any of the other 20 formulas tested were used.