Your eyes work a lot like a camera. The lens of a camera focuses light onto the film inside. The ...
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Your eyes work a lot like a camera. The lens of a camera focuses light onto the film inside. The cornea and lens in the front of your eye focus light onto the back, where light-sensitive tissue called the retina is located. When the retina receives an image, it sends a signal through the optic nerve to the brain for the image to be developed. Presbyopia occurs with age as the lens of the eye becomes less elastic. Light rays focus behind rather than directly on the retina. With this change, close objects appear out of focus.

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