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 ?
Practitioners should also be aware that this defect changes markedly with age, typically from with-the-rule astigmatism (cylinder axis approximately 180[degrees]) in childhood and early adulthood to against-the-rule astigmatism (cylinder axis approximately 90[degrees]) in presbyopia.