The human eyeball is somewhat like a camera, not in the
way it looks, but in the way that it works. Both have a
lens through which light passes. In the eye, the
external image is focussed on the retina, which is like
the film of a camera. The eyeball has three external
layers of tissue, which help to protect the eye and keep
the eyeball's shape. The outer layer is a supporting
layer which is known as the sclera. MORE!
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