ABSTRACT
PURPOSE: To compare the accuracy of different corneal power assessment techniques that do not require preoperative information with the clinical history method. METHODS: This retrospective study analyzed 50 eyes of 50 patients using 3-month postoperative data. Net corneal powers were obtained with each of the following methods: Maloney, Wang, Sonego-Krone, Srivannaboon, Shammas, Orbscan flat axis, and Gaussian optics formula with Orbscan. Results were compared to the clinical history method using paired sample t test, Bland-Altman plots, and linear regression. RESULTS: Both the Gaussian optics formula and Wang method were not significantly different from the clinical history method. The Sonego-Krone method significantly underestimated the corneal power, whereas the Maloney, Srivannaboon, Shammas, and Orbscan flat axis methods significantly overestimated the corneal power. CONCLUSIONS: The Gaussian optics formula and Wang method yielded comparable results with the clinical history method for assessing corneal power. The Gaussian optics formula produced the smallest standard deviation.
