Angle kappa changes after photorefractive keratectomy for myopia

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• 作者：Siamak Zarei-Ghanavati (1)
  Hamid Gharaee (2)
  Alireza Eslampour (2)
  Mojtaba Abrishami (1) (3)
  Soamaye Ghasemi-Moghadam (1)
  
• 关键词：Angle kappa ; Orbscan IIz ; Photorefractive keratectomy
• 刊名：International Ophthalmology
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：34
• 期：1
• 页码：15-18
• 全文大小：159 KB
• 作者单位：Siamak Zarei-Ghanavati (1)
  Hamid Gharaee (2)
  Alireza Eslampour (2)
  Mojtaba Abrishami (1) (3)
  Soamaye Ghasemi-Moghadam (1)
  
  1. Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  2. Cornea Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  3. Al-Zahra Eye Hospital, Zahedan University of Medical Sciences, Zahedan, Iran
  
• ISSN：1573-2630

文摘

The goal of this study was to compare differences in the mean angle kappa and its intercepts before and after photorefractive keratectomy (PRK) for myopia. 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) with a mean age of 26.70?±?4.89?years (18-4?years) were treated. 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 (?.562?±?0.074?mm) did not significantly differ from the values measured at 1 and 6?months after surgery (?.559?±?0.048 and ?.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.