title: Contact lens fitting for post-radial-keratotomy residual myopia.
abstract: OBJECTIVE
  To formulate guidelines for contact lens fitting following radial keratotomy and to achieve a relationship between contact lens fitting parameters and refractive and keratometric parameters.
  
  
  METHODS
  Thirty-five eyes of 30 patients who had post-radial-keratotomy residual myopia were evaluated for contact lens fitting. The base curve was selected by 'hit and trial' method until a proper fit was achieved, following which an over-refraction was done and final power of the contact lens obtained.
  
  
  RESULTS
  The mean contact lens base curve was 43.04 +/- 1.62 D, which was steeper than the postoperative keratometry by 2.35 +/- 0.74 D. The base curve and the postoperative keratometry were correlated by regression analysis (r = 0.895, P < 0.001). The mean overall diameter of the contact lenses was 9.64 +/- 0.08 mm. The mean contact lens power was 5.81 +/- 3.07 D, which was more myopic than the residual myopia by 2.79 +/- 1.67 D. Regression analysis showed definite correlation between the contact lens power and postoperative myopia (r = 0.854, P < 0.001).
  
  
  CONCLUSIONS
  For correction of post-radial-keratotomy residual myopia, contact lens fitting parameters can be determined by a regression formula using keratometric and refractive values.
authors.affiliation: Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. titiyal@rediffmail.com
authors.forename: Jeewan S
authors.initials: JS
authors.lastname: Titiyal
authors.forename: Ranjan
authors.initials: R
authors.lastname: Dutta
authors.forename: Rajesh
authors.initials: R
authors.lastname: Sinha
authors.forename: Namrata
authors.initials: N
authors.lastname: Sharma
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Dada
authors.forename: Rasik B
authors.initials: RB
authors.lastname: Vajpayee
mesh_terms: D000328:Adult; D003261:Contact Lenses; D005260:Female; D006801:Humans; D007646:Keratotomy, Radial; D008297:Male; D009216:Myopia / Q000628:therapy*; D011183:Postoperative Complications / Q000628:therapy*; D017410:Practice Guidelines as Topic; D017755:Prosthesis Fitting; D012029:Refraction, Ocular; D014792:Visual Acuity