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The human eye is one of the most complex organs in the body. Working together with the brain, it can rapidly adjust to changing light, detect motion, distinguish millions of colors, and process an enormous amount of visual information every second. Light enters through the cornea and pupil before being focused by the lens. It then passes through the vitreous humor and reaches the retina, where specialized cells convert light into electrical signals. Those signals travel through the optic nerve to the brain, which transforms them into the images you see every day. Despite centuries of advances in photography and imaging technology, the human visual system remains an extraordinary example of biological engineering.

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