Background: For calculating intraocular lens (IOL) power required for cataract surgery, ultrasonic biometry is used and the axial length of the eye is the most important error in this estimation. Therefore, the aim of this study is to evaluate the final refractive power based on the axis length of the eye in patients undergoing phacoemulsification cataract surgery.

Materials and Methods: In this cross-sectional study, from June 2010 till December 2011, 446 eyes which underwent phacoemulsification cataract surgery were investigated. Biometry was performed before cataract surgery to achieve emmetropia in all eyes. Based on the axis length of the eye, patients were classified into four groups: less than 22 mm, 22-24.5 mm, 24.5-26 mm, and more than 26 mm.

Results: There was not a significant difference in mean absolute value of final refractive power deviation from zero. The highest amount of mean absolute value of final refractive power deviation from zero was in myopia group which was equal to 1.52±1.17 diopter. However, there was not a significant difference in the amounts of mean absolute value of final refractive power deviation from zero according to axial length of the eye (p=0.081).

Conclusion: With increases in axial length of the eye, intraocular lens power calculation decreases, but the absolute difference of means is not significant in two apparatuses.