Nuances in the Workings of the Eye and Retina

Your eyes have chromatic aberration—the same color fringing that plagues camera lenses—but your brain simply learned to ignore it. That's why everything blurs underwater: the cornea does two-thirds of your focusing work in air, but can't refract light through water. Fish solved this differently, evolving massive spherical lenses. According to LessWrong, the eye lens reveals another marvel: it's built from cells that gradually sacrifice themselves, dying and transforming into transparent protein.

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