Front view of human eye

Front view of human eye

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Credit: ADAM HART-DAVIS/SCIENCE PHOTO LIBRARY

Caption: Human eye. Close-up of a human eye. See P420/327 for the same eye with the pupil dilated. The human eye works like a camera. The front curved part of the eyeball, the cornea, is a transparent lens that focuses light as it enters the eye. Contraction of muscles in the iris (the coloured part of the eye) changes the size of the pupil, the small aperture that controls how much light enters the eye. Behind the iris is a second lens which can vary its focusing power by flattening or thickening according to the distance of the object being viewed. Light is brought to a focus on a light-sensitive membrane called the retina on the inside back wall of the eyeball.

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Keywords: anatomy, close-up, eye, eyes, healthy, human body, pupil, sight, vision, visual sense

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