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Eyesight, a person’s ability to see, involves a complex interaction between the external objects in the environment, light, the two eyes, the optic nerves, and the left and right hemispheres of the brain. Visual acuity is the clarity or sharpness of vision. Loss of visual acuity may be caused by a variety of conditions, with some appearing in childhood and adolescence and others associated with injury or aging. Problems with eyesight are commonly treated with optical correction using glasses or...