Biology / Bio 2905 · Atom · ~20 seconds
Eye Anatomy: Cornea, Lens, Iris
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Light entering the eye is bent by the cornea and lens to focus on the retina, while the iris adjusts pupil size to regulate light entering.
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A lens that loses flexibility with age causes presbyopia, a farsightedness from focus falling behind the retina.
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Myopia and hyperopia both involve where the image focuses relative to the retina, but in opposite directions.