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 | In photography, a clear picture is obtained when light is precisely focused on the film in back of the camera. In the human eye, clear vision results when light is precisely focused on the retina, a thin membrane that lines the back inside wall of the eye. While a camera has only its lens to focus with, the eye has two structures, the cornea and the lens, that both work together to focus light. | ||
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| The cornea is the clear front surface of the eye. It is the structure that contact lenses are placed upon and the structure that is reshaped during laser vision correction. The amount of focusing provided by the cornea depends upon the steepness of its curvature. In other words, a steeply curved cornea focuses light more than a flat one. We'll explore this concept in greater detail when we discuss nearsightedness and farsightedness, so don't worry if it is not yet clear! The lens rests behind the colored part of the eye and is not normally visible. It contributes approximately 30% of the eye's focusing power, with the other 70% coming from the cornea. | |||
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