Cataract is a common cause of vision loss and blindness in humans. Now all efforts have focused on reducing postoperative astigmatism and providing an excellent vision after the cataract surgery.Determining the relationship between keratometry and corneal incision before and after phacoemulsification surgery in 100 patients undergoing cataract surgery in the Khatam Al- Anbiya (s) hospital of Mashhad city from March 2015 to March 2016.

In this cross sectional study, 100 patients (48 women and 52 men) with cataract undergoing phacoemulsification surgery were selected and Refraction, keratometry and visual acuity were measured before surgery. Then, a steep-based cut in the cornea was done without stitches. Cutting the cornea of 3.2 millimeter (mm) was performed in two superatemporal and temporal places. The patients were followed one month after surgery in terms of vision, refraction, and keratometry .

The mean age of patients with an age range of 42 to 84 years was 65.7 ± 9.54 years. No major complications were observed. The greatest mean of changes in corneal power was in Supra- temporal incision (1.28 ± 0.6). The keratometry had a significant relation with the incision (P <0/04).

Incision creation in the steepest Meridian leads to flatness of the Meridian and this effect is more on Supra- temporal incision. Temporal incision is recommended in cases where there is little difference in keratometry of two axes.