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Illustration of The eye

In a normal eye, light passes through the pupil and is focused by the lens onto the retina at the back of the eye. The retina converts light into electrical impulses that are carried to the brain. The brain interprets the impulses as visual images.

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Last Updated: 08/13/2007

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Provided by: RealAgeNov 5, 2009

Piling your favorite sandwich fixings on the right kind of bread could mean healthier blood pressure. The right choice? One hundred percent whole-grain.

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