An Introduction to the Anatomy of the Eye

To have normal vision, the light must be focused precisely onto the retina in the back of the eye.  This requires that both the cornea and the lens of the eye are clear and functioning correctly. When the lens becomes cloudy, it is called a cataract. This will reduce the amount of light and the clarity of the image entering the eye.

A graphic showing how light is obstructed by a cataract versus not being obstructed in a normal eye.

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