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Astigmatism is an inability of the eye to clearly focus images from any distance. This can occur because the shape of the cornea is not perfectly spherical.

Hyperopia (Farsightedness) is a focusing problem usually resulting from an eye that is too small, or a cornea that is too flat.

Myopia (Nearsightedness) occurs when the eye is too long in relation to it's focusing parts, or the cornea is to steep.

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โˆ™ 2011-10-04 22:32:58
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Q: What condition of the eyes is caused by the cornea not being spherical which causes an irregular focusing of light rays entering the eye?
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