The human eye is a complex optical instrument that allows you to see the world around you. Light enters through the cornea, passes through the lens, a
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What is accommodation and how does it work?
Accommodation is the ability of the eye to adjust focus for objects at different distances. The ciliary muscles contract to make the lens rounder for near objects and relax to make it flatter for distant objects. This changes the lens's refractive power to keep the image in focus on the retina.
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Why do we have two eyes instead of one?
Having two eyes provides binocular vision, which allows for depth perception (3D vision). Each eye sees slightly different angles of the same object, and the brain combines these two images to judge distance and see the world in three dimensions.
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What is the difference between rods and cones in the retina?
Rods are sensitive to low light and see in black and white; they are used for night vision but cannot detect color. Cones are sensitive to bright light and can detect color; they provide detailed, colorful vision but require more light. The eye has more rods than cones.
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