The FDA said it will collaborate with the U.S. Defense Department and the National Eye Institute to identify the percentage of patients who experience blurred vision, dry eyes and other side effects following laser eye surgery. The agency also will conduct a clinical trial tracking patients who undergo the procedure, which is expected to be completed in 2012, to better understand the risks and lessen the side effects of the surgery, said Dr. Jeffrey Shuren, the acting chief of the FDA's medical-device unit.

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