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Category: Science
Word Count: 898
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Bionic Eyes
Rods and Cones. Millions of them are in the back of every healthy human eye. They are biological solar cells in the retina that convert light to electrical impulses - impulses that travel along the optic nerve to the brain where images are formed.

Without them, we're blind.

Indeed, many people are blind - or going blind - because of malfunctioning rods and cones. Retinitis pigmentosa and macular degeneration are examples of two such disorders. Retinitis pigmentosa tends to be hereditary a

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