Eye & Contact Lens

Skip Navigation LinksHome > January 2011 - Volume 37 - Issue 1 > Corneal Refractive Therapy Gas Permeable Lenses for the Corr...
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.

Collapse Box

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.

Login

Article Tools

Share

Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.