astigmatism

(redirected from With-The-Rule Astigmatism)
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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 ?
In general terms, more effect is achieved when treating with-the-rule astigmatism and when treating older patients.
With-the-rule astigmatism was found in 30.36% of eyes, while against-the-rule was found in 52.41% of eyes.
The incidence of corneal with-the-rule astigmatism is unusually high in IN, (30,31) with 57% of individuals exceeding 2.00DC11 (1.85DC is the average).
(10) In regular astigmatism, if the bowtie is vertical, the eye has with-the-rule astigmatism; if it is horizontal it has against-the-rule astigmatism.
The diameter of the lens may be too big, or excessive amounts of with-the-rule astigmatism may be to blame.