There are several common eye disorders. The most common is due to aging of the eye, and is called Presbyopia This disorder affects most people by age 45 and they need corrective Lenses for near vision. This is an age related disorder because it is caused by aging cells of the Lens. Cells on the outer edges of the Lens are replaced regularly, however cells near the center of the Lens are not. Not only are these cells not replaceable but they are not bathed in the nutrient rich Aqueous Humor. These central cells die and become stiff and affect the cells elasticity.
Two other common disorders are Myopia and Hyperopia. Below find two links that will help define the differences between Hyperopia and Myopia.
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