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First Author: M.Abrishami IRAN
Co Author(s): S. Zarei-Ghanavati H. Gharaee A. Eslampour S. Ghasemi Moghadam
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The goal of this study was to compare differences in the mean angle kappa and its intercepts before and after photorefractive keratectomy (PRK).
Khatamal-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 (1834 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.