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Angle kappa changes after photorefractive keratectomy

Poster Details

First Author: M.Abrishami IRAN

Co Author(s):    S. Zarei-Ghanavati   H. Gharaee   A. Eslampour   S. Ghasemi Moghadam     

Abstract Details


The goal of this study was to compare differences in the mean angle kappa and its intercepts before and after photorefractive keratectomy (PRK).


Khatam–al-Anbia Eye Hospital, Eye Research Center , School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran


In a prospective controlled study, myopic patients were treated with aspheric wavefront-guided (personalized) PRK with a Bausch & Lomb Technolas 217z excimer laser. The manifest refraction, visual acuity, and angle kappa were evaluated preoperatively and at 1 and 6 months postoperatively. The same operator performed all angle kappa measurements using Orbscan IIz.


A total of 48 cases (96 eyes, 68.75% female) were treated, with a mean age of 26.70 ±4.89 years (18–34 years). The preoperative and postoperative mean angle kappa values were not significantly different (4.97 ±1.24 vs. 4.99 ±1.10 at 6 months). The average horizontal distance (x-intercept) between the visual axis and pupillary axis intersection on the corneal surface measured before surgery (-0.562 ±0.074 mm) did not significantly differ from the values measured at 1 and 6 months after surgery (-0.559 ±0.048 and -0.554 ±0.055 mm, respectively). Similarly, the average vertical distance (y-intercept) values did not differ before and at 1 and 6 months after surgery (0.156 ±0.225, 0.142 ±0.040, and 0.149 ±0.33 mm, respectively).


No differences in the angle kappa or its corneal intercepts were observed between pre- and post-PRK. This finding implies that PRK does not change the corneal vertex locations.

Financial Disclosure:


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