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Recovery of Refractive Error After Corneal Refractive Therapy

Barr, Joseph T. O.D., M.S., F.A.A.O; Rah, Marjorie J. O.D., Ph.D., F.A.A.O; Meyers, William Ph.D; Legerton, Jerome O.D., M.B.A.

doi: 10.1097/01.ICL.0000140234.85617.88

Purpose. To describe the regression of treatment (i.e., return toward baseline refractive error findings) after treatment with corneal refractive therapy (CRT).

Methods. After 6 to 9 months of treatment by a standardized protocol for CRT (application of high-Dk, proximity control, return zone contact lenses for overnight reduction of myopia), refractive error was measured within hours after awaking and at 8, 24, 48, and 72 hours. Comparison of regression is analyzed in four categories of achieved treatment. Logarithm of the minimum angle of resolution visual acuity regression was also measured.

Results. In general, refractive error returns to baseline after CRT for all measured ranges of refraction in the period of measurement of this study.

Conclusions. The greater the magnitude of CRT treatment, the more rapid the recovery is to baseline refraction.

From The Ohio State University College of Optometry, Columbus, OH (J.T.B.); The New England College of Optometry, Boston, MA (M.J.R.); and Pargaon Vision Sciences, Mesa, AZ (W.M. and J.L.).

Address correspondence and reprint requests to Dr. J.T. Barr, College of Optometry, The Ohio State University, 320 W. 10th Avenue, Columbus, OH 43201; e-mail:

Accepted April 29, 2004.

© 2004 Lippincott Williams & Wilkins, Inc.