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 How does the eye focus light?
The eye is like a camera, focusing light rays onto a film to
produce a picture. A camera uses a lens to focus light onto the
film. Similarly, the eye uses the cornea and the lens of the eye
to focus light on the retina. The lens is behind the blue, green,
or brown iris of the eye and it is responsible for the fine focus
ability of your vision. When you focus on a distant object, then
look at a mid-range computer screen, and finally read fine
print, your lens changes its shape and therefore its focal point
each time.
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