J Korean Ophthalmol Soc.  2005 Sep;46(9):1478-1485.

Change of Corneal Parameters after Removing Reverse Geometry Lens in Moderate Degree Myopia

Affiliations
  • 1Department of Ophthalmology, Chungnam National University, College of Medicine, Daejeon, Korea. opht@unitel.co.kr
  • 2Department of Ophthalmology, Seoul National University, College of Medicine, Seoul, Korea.

Abstract

PURPOSE
To investigate the recovery time associated with refractive and corneal topographic changes after discontinuing short term wear of reverse-geometry contact lenses in low and moderate myopic patients. METHODS: Twenty-four eyes of 12 patients who were fitted with Ortho-K LK(TM) lenses for a mean duration of 7.9 months were divided into two groups based on the mean manifest refraction (MR) of -3.50D. In groups I (mean MR -2.83D) and II (mean MR -4.00D), uncorrected visual acuity, refractive correction, and topographic changes were evaluated at 3 days; 1, 2, and 3 weeks; and 1, 2, 3, and 6 months after discontinuation of lens wear. Corneal thickness was measured at its center and 3.0 mm from its center. RESULTS: The uncorrected visual acuity, mean spherical equivalent, and average apical keratometric indices recovered at 2 weeks and 1 month after discontinuation of lens wear in groups I and II, respectively. Mean Sim K and corneal thickness recovered at 1 and 2 weeks in groups I and II, respectively. All of the recovered indices remained stable at 6 months. CONCLUSIONS: Recovery of corneal changes after short-term use of reverse-geometry lenses was achieved at 2 weeks in cases of low myopia (less than -3.50D) and at 1 month in cases of moderate myopia (more than -3.50D), with both remaining stable to the 6-month mark.

Keyword

Corneal thickness; Mean spherical equivalent; Orthokeratology; Reversibility

MeSH Terms

Contact Lenses
Humans
Myopia*
Visual Acuity
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