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7 Cards in this Set
- Front
- Back
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pupil
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the hole that lets different amounts of light into the eye
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cornea
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a thick layer of transparent material that protects the front of the eye. Also helps to focus light.
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optic nerve
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carries electrochemical signals to the brain.
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lens
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made of flexible, jelly-like material. Brings light rays to a focus on the retina.
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iris
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the ring of colored tissue that controls the size of the pupil.
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muscles
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this controls the shape of the lens. When it is relaxed the lens is thin to focus rays from the distant objects. When it contracts the lens becomes thick to focus on close-up objects.
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retina
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This is a layer of light sensitive cells and nerve endings on which an image forms.
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