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Eye & Contact Lens: Science & Clinical Practice:
doi: 10.1097/ICL.0b013e3182048fd1
Article

Corneal Refractive Therapy Gas Permeable Lenses for the Correction of Hyperopia After One Night of Lens Wear

Sorbara, Luigina O.D., M.Sc.; Lu, Fenghe M.D., M.Sc., Ph.D.

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Abstract

Purpose: To examine the refractive and keratometric response of corneal refractive therapy (CRT) contact lenses for hyperopia (CRT) after a single night of contact lens wear with the goal of reducing hyperopia by +3.50 D.

Method: Twenty participants were fitted with a CRT HDS 100 contact lens, in one eye only. The back optic zone radius of the CRT lens was designed to correct 3.50 D of hyperopia. The eyes were randomly selected. The Nikon Auto Refractor was used to measure refractive error. Corneal topography and simulated K readings were measured using the Humphrey Atlas topographer. The lens was subsequently worn overnight, and the lens was assessed the next morning on awakening.

Results: Refractive error changed by 1.50±0.71 D (mean ± SD, range 0.50-2.75 D) immediately after lens removal in the experimental eye. Similarly, there was a change in flat K readings of 0.58±0.62 D with a range of −0.25 to +1.87 D. These results were significantly different from the baseline measurements (P<0.0001).

Conclusions: The fitting of CRT HDS for hyperopia has a significant effect on corneal shape and refractive error. There was a moderate yet significant steepening of the cornea.

© 2011 Lippincott Williams & Wilkins, Inc.

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