What does astigmatism mean?

Definitions for astigmatism
əˈstɪg məˌtɪz əm; əˈstɪg mi əastig·ma·tism

This dictionary definitions page includes all the possible meanings, example usage and translations of the word astigmatism.

Princeton's WordNet

  1. astigmatism, astigmianoun

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

  2. astigmatism, astigmianoun

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

Wiktionary

  1. astigmatismnoun

    A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.

  2. astigmatismnoun

    A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

  3. Etymology: From a- + stem of

Wikipedia

  1. Astigmatism

    Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power. This results in distorted or blurred vision at any distance. Other symptoms can include eyestrain, headaches, and trouble driving at night. Astigmatism often occurs at birth and can change or develop later in life. If it occurs in early life and is left untreated, it may result in amblyopia.The cause of astigmatism is unclear; however, it is believed to be partly related to genetic factors. The underlying mechanism involves an irregular curvature of the cornea and protective reaction changes in the lens of the eye, called lens astigmatism, that has the same mechanism as spasm of accommodation. Diagnosis is by an eye examination called autorefractor keratometry (objective, allows to see lens and cornea components of astigmatism) and subjective refraction, but subjective methods are almost always inaccurate, if lens astigmatism is not fully removed first with a week of eye drops.Three treatment options are available: glasses, contact lenses, and surgery. Glasses are the simplest. Contact lenses can provide a wider field of vision and less artifacts than even double aspheric lenses. Refractive surgery permanently changes the shape of the eye and thereby cures astigmatism.In Europe and Asia, astigmatism affects between 30 and 60% of adults. People of all ages can be affected by astigmatism. Astigmatism was first reported by Thomas Young in 1801.

ChatGPT

  1. astigmatism

    Astigmatism is an eye condition characterized by an imperfection in the curvature of the eye’s cornea or lens, causing distorted or blurred vision. It is a type of refractive error where light rays entering the eye aren't focused evenly onto the retina, leading to a failure to clearly see at any distance. It's usually present from birth, but can change over time, and is often combined with nearsightedness or farsightedness.

Webster Dictionary

  1. Astigmatismnoun

    a defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision

  2. Etymology: [Gr. 'a priv. + , , a prick of a pointed instrument, a spot, fr. to prick: cf. F. astigmatisme.]

Wikidata

  1. Astigmatism

    An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- meaning "without" and στίγμα, "a mark, spot, puncture".

Chambers 20th Century Dictionary

  1. Astigmatism

    a-stig′ma-tizm, n. a defective condition of the eye, in which rays proceeding to the eye from one point are not correctly brought to a focus at one point.—adj. Astigmat′ic. [Gr. a, neg., and stigma, stigmat-os, a point.]

U.S. National Library of Medicine

  1. Astigmatism

    Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed)

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Numerology

  1. Chaldean Numerology

    The numerical value of astigmatism in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of astigmatism in Pythagorean Numerology is: 5

Examples of astigmatism in a Sentence

  1. Jessica Sinclair:

    We started to notice that she was having issues reaching her milestone of crawling, so at her regular pediatric check they did an eye screening and saw that she might have had a slight astigmatism.

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"astigmatism." Definitions.net. STANDS4 LLC, 2024. Web. 27 Feb. 2024. <https://www.definitions.net/definition/astigmatism>.

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    the act of catching an object with the hands
    • A. muddle
    • B. hunch
    • C. snap
    • D. mitre

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