The steepest and flattest meridians of an eye with astigmatism are called the principal meridians. In some cases, astigmatism is caused by the shape of the lens inside the eye. This is called lenticular astigmatism, to differentiate it from the more common corneal astigmatism. Astigmatism Meaning and Definition. by admin on June 12, 2011.Heredity is thought to be the primary cause of the development of astigmatism. If your parents or grandparents suffer from astigmatism, there is a good chance that you too will develop astigmatism. English Dictionary | astigmatism. English definition English synonyms English-Spanish English-French English-Italian Spanish-English French-EnglishWordReference Random House Learners Dictionary of American English 2018. astigmatism /stgmtzm/USA pronunciation n. Arabic Belarusian Catalan Chinese Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Lao Norwegian Polish Portuguese Romanian Russian Slovak SlovenianDefinition of "astigmatism" [astigmatism]. Meaning and definition of astigmatism : A lens aberration or defect that is caused by the inability of a simple lens to focus oblique rays uniformly. For the term astigmatism may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for 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. We found 50 dictionaries with English definitions that include the word astigmatism: Click on the first link on a line below to go directly to a page where " astigmatism" is defined.
General (29 matching dictionaries). English.Astigmatism definitions. 1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea common in nearsighted people. Astigmatism Definition, Etiology, Classification, Diagnosis and Non-Surgical Treatment. Dieudonne Kaimbo Wa Kaimbo Department of Ophthalmology, University of Kinshasa, DR Congo. Definition of the English word astigmatism, American and British pronunciation, transcription. home > medical dictionary definitions a-z list > astigmatism definition.Significant astigmatism can cause headaches, eye strain, and seriously blurred vision.
Astigmatism is often not detected during routine eye screening in schools. Astigmatism Definition. Noun: astigmatism ustig-mu,ti-zum. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea common in nearsighted people - astigmia. Importantly, the axes and magnitudes of external and internal astigmatism do not necessarily coincide, but it is the combination of the two that by definition determines the overall optics of the eye.Simple English. It is an imperfection of the curvature of the eyes which may cause blurred and imperfect vision. In astigmatism, the eye structure is a bit deformed, preventing the eyes from generating normal images.English Spanish. Definition of Astigmatism. Babylon English.English Wikipedia - The Free Encyclopedia. An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. There are multiple kinds of astigmatism, including one in which the cornea is not perfectly round, which is the main reason for astigmatism.Youre viewing YouTube in English (US). You can change this preference below. 1962]. Values greater than 1.Astigmatism Definition.
Astigmatic eyes: Simple myopic astigmatism: one meridian focuses light in front of the retina. and fatigue are also among the most common astigmatism symptoms. astigmatism. Definition from Wiktionary, the free dictionary. Jump to: navigation, search. Contents. 1 English.Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layoutTranslations. People who have astigmatism see images as distorted, so they need to wear glasses or contact lenses. Sometimes people mistakenly say, "One of my eyes has a stigmatism." But the a in astigmatism is important to its meaning. Meaning and definition for "astigmatism" word. [noun] (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point [noun] (ophthalmology) impaired eyesight resulting usually from irregular36.4 of vowels is 2.2 less then average English word. Astigmatism definition: If someone has astigmatism , the front of their eye has a slightly irregular shape, so |English Dictionary Thesaurus Translator Grammar Scrabble Blog. User Contributed Dictionary. English. Etymology. From astigmatic.Russian: астигматизм. Extensive Definition. In optics, astigmatism is when an optical system has different foci for rays that propagate in two perpendicular planes. Definition of astigmatism - a defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays.Home British World English astigmatism. ASTIGMATISM Defined for English Language Learners.Definition of astigmatism for English Language Learners. medical : a problem with the eye that prevents a person from seeing clearly. English.Definition. a vision disorder. Astigmatism is caused by an abnormal curvature of the cornea or lens. astigmatism definition: 1. an irregularity in the curvature of a lens, including the lens of the eye, so that light rays from an object do not meet in a single focal point, resulting in an indistinct or distorted image 2. distorted view or judgment, as beSpanish-English Translation. 1.1 Third-order astigmatism. 1.2 Astigmatism in systems that are not rotationally symmetric.English. Etymology. From astigmatic.Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations. Translations in context of "астигматизм" in Russian-English from Reverso Context: Различные хирургические технологии позволяют лечить лазером, особенно близорукость, дальнозоркость, астигматизм. Hyperopia (U.S. English). Hypertropia.Definition: An optical system with astigmatism is one in which rays of light propogating in two perpendicular planes reach points of focus (plural:"foci") at different locations in space. Definition Synonyms Antonyms Related words Rhymes. Search. Dictionary. A. Astigmatism.Important information. Word Panda provides you with a huge database of English words. Astigmatism Definition, Etiology, Classification, Diagnosis and Non-Surgical Treatment. Dieudonne Kaimbo Wa Kaimbo Department of Ophthalmology, University of Kinshasa, DR Congo. anastigmatism in English. translation and definition "anastigmatism", Dictionary English-English online. Definition of Astigmatism from all online and printed dictionaries, photos and videos about Astigmatism.Definition of the noun astigmatism. What does astigmatism mean as a name of something? English.Top definition.Usually causes bad eyesight up to and including legal blindness. My astigmatism is a difficult affliction. Definition of astigmatism in the AudioEnglish.org Dictionary.Dialogues Narrations Phrases Pronunciation Role-play exercises QA Online tests All English-learning resources. Define astigmatism. astigmatism synonyms, astigmatism pronunciation, astigmatism translation, English dictionary definition of astigmatism. astigmatism top: normal eyeastigmatism. a defect in a lens, eye, or mirror that causes rays from one direction not to focus at one point. — astigmatic, adj. Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegiandefinition - ASTIGMATISM EYE. definition of Wikipedia. Advertizing . Astigmatism. Definition."astigmatism." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 17 Feb. Definitions of astigmatism: noun: (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point. noun: (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea. What is the definition of astigmatism? In order to see clearly, the eye must be able to focus light into a single plane at the surface of the retina. The word astigmatism comes from the Greek "a" meaning "without" and "stigma" meaning "spot." British Dictionary definitions for astigmatism.William Whewell (1794-1866), English polymath, from Greek a- "without" (see a- (3)) stigmatos genitive of stigma "a mark, spot, puncture" (see stick (v.)). definition : astigmatism. Astigmatism is a type of refractive error in which the eye does not focus light evenly on the retina. If it occurs early in life it can result in amblyopia. Home » Astigmatism Definition For Dummies. What Is Astigmatism? Updated: February 26th, 2018 | by Veit Mehler.It is accredited to the English astronomer and mathematician Sr George Biddell Airy who wrote the first paper on the condition. His model was just a handheld disc. Translation Definition. English English - astigmatism. n. unequal curvature of the lens of the eye creating a distorted image.English Russian - astigmatism. с. астигматизм. » Examples. What is Astigmatism? In astigmatism, the eye focuses images on more than one point rather than the single point of normal vision. An eye astigmatism can be accompanied by farsightedness, making it difficult for them to focus on close objects. Definition, Translation and Meaning of "astigmatism" for learners of English. Online Dictionary.Search Quotes, Phrases and Definitions with «astigmatism» astigmatism definition, meaning, what is astigmatism: a fault in the lens of the eye that reduces the quality of sight, especially a fault that.Definition of astigmatism - English Dictionary. Definition of astigmatism in the Definitions.net dictionary.Information and translations of astigmatism in the most comprehensive dictionary definitions resource on the web. English American English Academic English Collocations Practical English Usage German- English English-German. Definition of astigmatism noun from the Oxford Advanced Learners Dictionary. Definition of astigmatism written for English Language Learners from the Merriam-Webster Learners Dictionary with audio pronunciations, usage examples, and count/noncount noun labels.astigmatic eyes.