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| Refractive Errors |
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 Normal, clear vision is the result of light rays passing through the cornea, pupil and lens and focusing directly on the retina. |
 Nearsightedness, or myopia, occurs when light is focused in front of the retina, resulting in poor distance vision. This is caused by a cornea that is too curved or an eye where the distance from the cornea to the retina is too long. |
 Farsightedness, or hyperopia, occurs when light is focused beyond the retina, resulting in poor close vision. Distance vision may also be blurry. This is caused by the cornea being too flat
or the distance from the cornea to the retina being too short. |
 Astigmatism causes distorted and blurry vision which may occur with both nearsightedness and farsightedness. It occurs when the cornea's surface is irregular which causes light to focus in more than one point on the retina. |
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