astigmatism

noun
astig·ma·tism | \ ə-ˈstig-mə-ˌti-zəm \

Definition of astigmatism 

1 : a defect of an optical system (such as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image

2 : a defect of vision due to astigmatism of the refractive system of the eye and especially to corneal irregularity

3 : distorted understanding suggestive of the blurred vision of an astigmatic person

Examples of astigmatism in a Sentence

Recent Examples on the Web

But these astigmatism-correcting lenses can be implanted during traditional or laser surgery, Akpek said. Sarah Gantz, Philly.com, "She didn't have $3,000 for cataract surgery - until an Inquirer reader stepped up," 21 Mar. 2018 Luckily, there are colored contacts for pretty much everyone, though some types, such as those for astigmatism, might be more expensive. 7. Elizabeth Denton, Seventeen, "7 Things You Need To Know Before Trying Colored Contacts," 16 Oct. 2017 Of the overall cases, 69 percent arose from simple uncorrected refractive errors, which include myopia (nearsightedness), hyperopia (farsightedness) and astigmatism (blurry vision up close, far away or both). By Sue Arrowsmith, miamiherald, "Children’s vision problems often go undetected, then get worse," 24 July 2017 Breaking: Easter Bunny able to afford glasses to correct astigmatism, thanks to continued coverage under Obamacare. Diana Bruk, Marie Claire, "The 16 Funniest Tweets About This Year's White House Easter Egg Roll," 17 Apr. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'astigmatism.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of astigmatism

1831, in the meaning defined at sense 1

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Time Traveler for astigmatism

The first known use of astigmatism was in 1831

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More Definitions for astigmatism

astigmatism

noun

English Language Learners Definition of astigmatism

medical : a problem with the eye that prevents a person from seeing clearly

astigmatism

noun
astig·ma·tism | \ ə-ˈstig-mə-ˌtiz-əm \

Medical Definition of astigmatism 

1 : a defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image

2 : a defect of vision due to astigmatism of the refractive system of the eye and especially to corneal irregularity — compare emmetropia, myopia

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occurring twice a year or every two years

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