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eyeball
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Diagram of a horizontal section of the human eye showing labeled parts including the cornea, iris, lens, retina, sclera, optic nerve, and blood vessels, with internal structures and muscles visible. Close-up of a child's blue eye, showing detailed iris patterns and fine eyelashes. Side-by-side diagrams compare a nearsighted eye, where light focuses in front of the retina, with a normal eye, where light focuses on the retina. Both eyes are labeled with cornea, lens, retina, and sclera. Side-by-side diagram comparing a farsighted (hyperopic) eye and a normal eye, showing how light focuses behind the retina in hyperopia and directly on the retina in a normal eye, with labeled parts including lens, cornea, sclera, and retina.
At a Glance
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eye summary
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Images

cross section of the eye
Horizontal cross section of the human eye, showing the structures of the eye, the...
Encyclopædia Britannica, Inc.
human eye
The human eye.
© Andrey Armyagov/Shutterstock.com
Myopia
Glasses that have concave lenses to allow near objects to be brought into focus by...
Encyclopædia Britannica, Inc.
Hyperopia
Glasses that contain convex lenses to reduce the accommodative effort required for...
Encyclopædia Britannica, Inc.
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