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Astigmatism   /əstˈɪgmətˌɪzəm/   Listen
Astigmatism

noun
1.
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people.  Synonym: astigmia.
2.
(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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"Astigmatism" Quotes from Famous Books



... "You're suffering from astigmatism, Bathurst," he said. "Doubtless it was Colton whom you saw stowing it away. I think we'd better tear it into little bits as we have no further use ...
— The Shades of the Wilderness • Joseph A. Altsheler

... 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 and strong ...
— Initiative Psychic Energy • Warren Hilton

... study, restlessness follow. If, however, the eyes are so near the normal that their story reads 12/10 or 8/10, the strain will be negligible for the present. If, on the other hand, the only difficulty is a confusion of x and z with c and g, it means that there is a strain due to astigmatism, and that the child should ...
— Civics and Health • William H. Allen

... step, but I should not desert them without cause. They may think, perhaps, that I am making much ado about nothing and could be treated just as well in Harrisburg. To such let me explain that I am suffering from astigmatism. It is not so much that I cannot see, but that I sees things which I know are not there—a defect in sight which I feel needs the most expert attention. Sunday-school at half-past nine; divine service at eleven. I take for my text 'And the old ...
— Humorous Ghost Stories • Dorothy Scarborough

... Ophthalmoscopy, Accommodation, Astigmatism, Aberration and Entoptic Phenomena, etc.—in fact, the entire book contains so much that is new, practical and necessary that no refractionist can afford ...
— Watch and Clock Escapements • Anonymous



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



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