US scientists have identified two genes responsible for macular degeneration, the gradual deterioration of eyesight in the elderly that can lead to blindness, a study showed this week.The research published 24 April 2007, in the Journal of the American Medical Association also showed that smoking and being overweight carry a strong risk of the condition, in which the central part of the eye's retina degenerates.
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Your brain on déjà vu
Ever experienced déjà vu? CNN's Sanjay Gupta explains what's happening in your brain when it occurs.
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US scientists have identified two genes responsible for macular degeneration, the gradual deterioration of eyesight in the elderly that can lead to blindness, a study showed this week.The research published 24 April 2007, in the Journal of the American Medical Association also showed that smoking and being overweight carry a strong risk of the condition, in which the central part of the eye's retina degenerates.
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