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Contact lens fitting for post‐radial‐keratotomy residual myopia
Author(s) -
Titiyal Jeewan S,
Dutta Ranjan,
Sinha Rajesh,
Sharma Namrata,
Dada Vijay K,
Vajpayee Rasik B
Publication year - 2003
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1046/j.1442-9071.2003.00599.x
Subject(s) - radial keratotomy , medicine , optometry , ophthalmology , residual , contact lens , optics , refractive error , eye disease , mathematics , physics , algorithm
Purpose: 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). Conclusion: For correction of post‐radial‐keratotomy residual myopia, contact lens fitting parameters can be determined by a regression formula using keratometric and refractive values.