Astigmatism is a visual disorder where the eye cannot properly focus
due to misshapen cornea or lens.
Unlike myopia (near-sightedness) and hyperopia (far-sightedness),
which are both poorly focused in one particular direction,
the visual disorder is more complex in astigmatism,
with more complex variations.
Although astigmatism is not the same as myopia or hyperopia,
it often occurs in people with either of these conditions.
Astigmatism: Astigmatism is a condition in which the uneven curvature of the cornea blurs and distorts both distant and near objects. A normal cornea is round, with even curves from side to side and top to bottom. With astigmatism, the cornea is shaped more like the back of a spoon, curved more in one direction than in another. This causes light rays to have more than one focal point and focus on two separate areas of the retina, distorting the visual image. Two-thirds of Americans with myopia also have astigmatism.1
Researching symptoms of Astigmatism: Further information about the symptoms of Astigmatism is available including a list of symptoms of Astigmatism, other diseases that might have similar symptoms in differential diagnosis of Astigmatism, or alternatively return to research other symptoms in the symptom center.
Misdiagnosis and Astigmatism: Research more detailed information about misdiagnosis of Astigmatism, underlying causes of Astigmatism (possibly misdiagnosed), or research misdiagnosis of other diseases
Treatments for Astigmatism: Various information is available about treatments available for Astigmatism, or research treatments for other diseases.
Statistics and Astigmatism:
Various sources and calculations are available in statistics about Astigmatism,
prevalence and incidence statistics for Astigmatism,
and you can also research other medical statistics in our statistics center.
1. excerpt from Facts About the Cornea and Corneal Disease: NEI
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