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Psychology  /  Psych 0398  ·  Atom · ~20 seconds

The Cornea and Lens

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The cornea and lens focus incoming light onto the retina, with the lens changing shape to focus at different distances.

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The lens thickens to focus on a page held close and flattens to focus across a room.

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Focusing is not detection. A perfectly focused image on a damaged retina produces nothing.