astigmatism


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  • noun

Synonyms for astigmatism

(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea

(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

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References in periodicals archive ?
Astigmatism is an eye condition in which the curve of the cornea is not entirely round in shape, making it difficult for the patient to clearly focus on an object and results in blurred vision.
00 diopters (D) of spherical equivalent of myopia or myopia with astigmatism, with up to -7.
We have considered how the patient perceives and responds to the astigmatism on the periphery of their vision, and how their sensitivity is actually quite different when comparing reading to intermediate and again to distance," Mr Hoioran added.
If so, there would be a change in internal astigmatismthe difference between corneal astigmatism at the front of the eye and total astigmatism measured from the whole eye.
Although small, the magnitude of astigmatism caused by incision depends on the size and its location.
The most common type of astigmatism was simple hypermetropic astigmatism (16%), simple myopic astigmatism (14.
Results: Among the total 288 patients, with-the-rule astigmatism (n=21; 55%) had greater frequency in the 26-35 years sub-group.
But in most cases an astigmatism is present from birth.
As of a couple of weeks ago, she also has 20/40 vision in both eyes, and no astigmatism.
Because standard contact lenses are free to rotate as they sit on the eye's surface, they can't correct for astigmatism, a condition in which the cornea doesn't have a spherical shape.
Those with prescriptions that correct for astigmatism are less fortunate.
Long term risks of LASIK for myopia with and without astigmatism beyond 12 months have not been studied.
This article will discuss the key surgical options available for surgical treatment of regular astigmatism, with emphasis on the advantages and disadvantages of each option.
For children with severe astigmatism, wearing glasses to correct blurred vision can significantly improve accurate reading speed, reports a study in the February issue of Optometry and Vision Science, official journal of the American Academy of Optometry.