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AAO-SOE Joint Meeting research highlights
Date:11/8/2008

,000 people; reported rates vary with the criteria used for diagnosis. Unofficial reports indicate this disorder may be more prevalent in the Indian subcontinent, Arabia, and New Zealand. Although usually a progressive disease, recent data suggests that it stabilizes after time in most patients, and that treatment with rigid contact lenses is successful for many. Ten to 20 percent of keratoconus patients in the US eventually receive corneal transplants to restore their vision.

Co-investigators Mohan Rajan, MD, and Sujatha Mohan, MD, of the Rajan Eye Care Hospital, India, studied collagen crosslinking in 48 patients (60 eyes), aged 12 to 48 years, who had progressive keratoconus. The collagen crosslinking technique, developed in recent years, is under study for the treatment of several eye disorders. In keratoconus patients, drops containing riboflavin, a B-complex vitamin, are applied to the cornea which is then exposed to UVA light; this stimulates collagen fibers to connect to one another, or crosslink. Collagen is the primary protein constituent of the body's connective tissues. The procedure helps restore appropriate curvature and structure to the cornea, and makes it possible for most patients who need them to wear rigid contact lenses again. Collagen crosslinking may prove a viable alternative to cornea transplant, and three FDA-approved trials are now underway in the US.

The Rajan-Mohan study involved 40 eyes (group A) in which infected tissue and any foreign matter were removed from the top tissue layer, and 20 eyes (group B) in which the tissue layer was left intact prior to treatment. Patients received follow-up exams at one, three, six and twelve months. Vision corrected with eyeglasses or contact lenses improved in 45 percent of patients by six months, but no change was noted in any patients' vision when measured without eyeglasses or contact lenses. The corneal curve flattened appropriately in 51 of 60 eyes (85 percent), with more si
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Contact: Mary Wade
mwade@aao.org
415-531-3061
American Academy of Ophthalmology
Source:Eurekalert

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