ASTIGMATISM • E-FREE TRANSLATION.COM • Definition of Astigmatism

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/əstˈɪgmətˌɪzəm/ Listen

Astigmatism

noun

(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people. Synonym: astigmia.

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

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Etymology of 'Astigmatism'

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"Astigmatism" Quotes from Famous Books

... one-hundreth part of an inch had been worn away from some of the threads. The old screws were consequently discarded, and new ones were made by Mr Simms.—The adjustment of the Spectroscope has occupied a great deal of attention. There was astigmatism of the prisms; and false light reflected from the base of the prisms, causing loss both of light and of definition. The latter defect was corrected by altering the angles, and then astigmatism was corrected by a cylindrical ...

— Autobiography of Sir George Biddell Airy • George Biddell Airy

... are blurred and invisible. To detect the cause and degree of defects of the eyes it is necessary to try out the eyes by using a trial spectacle frame and inserting detached lenses before the right eye and the left eye alternately. One of the most common forms of defective vision is astigmatism. A chart has been designed with a series of circles and straight lines radiating from the center. If the subject is astigmatic he will see some of the straight lines distinctly while others will be blurred. For instance, one or two of the vertical lines may appear very black ...

— Initiative Psychic Energy • Warren Hilton

... various means available for sharpening their eyesight. As an onlooker it seems to me safe to say that the lenses recommended by both the "radicals" and their vivid opponents rather tend to increase than diminish our natural astigmatism. ...

— The Mind in the Making - The Relation of Intelligence to Social Reform • James Harvey Robinson

Words linked to "Astigmatism" : ametropia, keratoconus, condition, ophthalmology, stigmatism, optics, keratectasia, status, astigmatic