title: Use of angle kappa in myopic photorefractive keratectomy.
abstract: OBJECTIVE
  To explore utilization of the coaxially sighted corneal light reflex (CSCLR) for centration during myopic photorefractive keratectomy (PRK) for patients with relatively high angle kappa (κ) values.
  
  
  METHODS
  Patients were stratified into two groups preoperatively, on the basis of angle κ values. Group A was composed of 166 eyes with an angle κ value <5°. Group B consisted of 182 eyes with an angle κ value >5°. Intraoperative centering of ablation was performed within group A by utilizing the pupillary center, and within group B by using the CSCLR. Visual acuities were evaluated and compared at 6 months and 12 months postoperatively between groups.
  
  
  RESULTS
  Mean uncorrected visual acuities (UCVA) for all patients at 6 months and 12 months were -0.073 logMAR and -0.080 logMAR, respectively. A total of 98.9% of patients had a UCVA of 0.00 logMAR (≈20/20 Snellen) 12 months postoperatively. There was not a significant between-group difference in regard to residual refractive error at 6 months or 12 months (P=0.53 and P=0.97), or in UCVA at 6 months and 12 months (P=0.76 and P=0.17). There were no subjective complaints of monocular diplopia, glare, or haloes within either group at any time during follow-up.
  
  
  CONCLUSIONS
  Availing use of the CSCLR for centration of ablation within myopic patients with high angle κ values may aid in providing better refractive outcomes after performance of PRK.
authors: Department of Ophthalmology, The University of Mashhad, Mashhad, Iran.
authors: Hamid
authors: H
authors: Khakshoor
authors: Department of Ophthalmology, The University of New Mexico, School of Medicine, Albuquerque, NM, USA.
authors: Michael V
authors: MV
authors: McCaughey
authors: Department of Ophthalmology, The University of Mashhad, Mashhad, Iran.
authors: Amir Hossein
authors: AH
authors: Vejdani
authors: Department of Ophthalmology, The University of Mashhad, Mashhad, Iran.
authors: Ramin
authors: R
authors: Daneshvar
authors: Department of Ophthalmology, Francis I Proctor Foundation, University of California San Francisco, CA, USA.
authors: Majid
authors: M
authors: Moshirfar
keywords: CSCLR; PRK; Purkinje reflex; angle kappa; myopia; photorefractive keratectomy