Fig. 1. Mean numeric prediction error (PE). A comparison of mean arithmetic PE between the Haigis-L, Shammas, Barrett True-K, and Wang-Koch-Maloney (WKM) methods with Haigis formulas using input values from the Pentacam system. The most accurate corneal power adjustment and formula combinations were the Haigis-L, Barrett True-K, and total corneal refractive power (TCRP) 4 mm (Haigis). TNP = true net power; TRP = total refractive power.
