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The Ophthalmology
Survival Guide
Astigmatism
Astigmatism is an optical problem in which the refractive power of the eye is not perfectly spherical, but instead is sphero-cylindrical.
Survival Tips!
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Light rays are focused differently depending on the meridian in which they are oriented, leading to multiple focal points. These focal points can be myopic, hyperopic, or a combination of both.
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Astigmatism can be regular (i.e. perfectly sphero-cylindrical with two principle focal points) or irregular (i.e. numerous focal points).
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Unlike hyperopia or myopia, the blur caused by astigmatism is not eliminated by accommodation or changes in viewing distance.
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