Researchers at the University of Pennsylvania School of Medicine have identified proteins in the rod and cones of the eye that could lead to the discovery of the genetic causes of a host of inherited eye diseases. The investigators hope to gain a clearer understanding of what goes wrong at the most basic level in these diseases that cause blindness and other disorders.

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Several research centers across the United States are studying whether or not dietary supplements help prevent age-related macular degeneration, a leading cause of blindness in older adults. A previous study concluded that supplements with antioxidants and zinc reduced the risk by about 25 percent.