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What
is Normal Vision? In the normal eye, light is bent (refracted) by the curve of the cornea and lens to focus clearly on the retina. With myopia (nearsightedness) the eye is too long (or cornea is too steep) causing light to focus in front of the retina. When the image reaches the retina it is out of focus (blurred). Hyperopia (farsightedness) is a condition where the eye is shorter (or the cornea is flatter) causing light rays to focus behind the retina. When the image meets the retina it is out of focus (blurred). Astigmatism is a condition where the cornea or lens is shaped like a football with two curves or powers. Each curve focuses light rays in a different spot. If these light rays do not focus on the retina, the vision is blurred. With modern Lasers, most vision problems can be corrected! Presbyopia
is a condition that affects all people over 40-45 years of age.
The lens stiffens or the muscle weakens and the patient is unable
to focus clearly on small objects or print. |