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ametropia
am·e·tro·pi·a A0253400 (ăm′ĭ-trō′pē-ə)n. An eye abnormality, such as nearsightedness, farsightedness, or astigmatism, resulting from faulty refractive ability of the eye.
[Greek ametros, without measure (a-, without; see a-1 + metron, measure; see meter1) + -opia.]
am′e·trop′ic (-trŏp′ĭk, -trō′pĭk) adj.ametropia (ˌæmɪˈtrəʊpɪə) n (Medicine) loss of ability to focus images on the retina, caused by an imperfection in the refractive function of the eye[C19: New Latin, from Greek ametros unmeasured (from a-1 + metron measure) + ōps eye]am•e•tro•pi•a (ˌæm ɪˈtroʊ pi ə)
n. faulty refraction of light rays by the eye, as in astigmatism or myopia. [1875–80; < Greek ámetr(os) unmeasured (a- a-6 + -metros, adj. derivative of métron measure) + -opia] am`e•trop′ic (-ˈtrɒp ɪk, -ˈtroʊ pɪk) adj. Thesaurus| Noun | 1. |  ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopiaophthalmology - the branch of medicine concerned with the eye and its diseasesvision defect, visual defect, visual disorder, visual impairment - impairment of the sense of sightmyopia, nearsightedness, shortsightedness - (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurredastigmatism, astigmia - (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted peoplehypermetropia, hypermetropy, hyperopia, longsightedness, farsightedness - abnormal condition in which vision for distant objects is better than for near objects |
Translationsametropia
ametropia [am″ĕ-tro´pe-ah] an ocular disorder in which parallel rays fail to come to a focus on the retina. adj., adj ametrop´ic.am·e·tro·pi·a (am-ĕ-trō'pē-ă), Do not confuse this word with emmetropia.An optic condition in which an error of refraction occurs such that with the eye at rest the retina is not in conjugate focus with light rays from distant objects, that is, only less distant objects are focused on the retina. [G. ametros, disproportionate, fr. a- priv. + metron, measure, + ōps, eye] ametropia (ăm′ĭ-trō′pē-ə)n. An eye abnormality, such as nearsightedness, farsightedness, or astigmatism, resulting from faulty refractive ability of the eye.
am′e·trop′ic (-trŏp′ĭk, -trō′pĭk) adj.am·e·tro·pia (am'ĕ-trō'pē-ă) The optic condition in which there is an error of refraction so that with the eye at rest the retina is not in conjugate focus with light rays from distant objects, i.e., only less distant objects are focused on the retina. [G. ametros, disproportionate, fr. a- priv. + metron, measure, + ōps, eye]ametropia Any deviation, in the relaxed focus of the eye, from the normal state in which distant objects form sharp and clear images on the RETINA. Ametropia may take the form of HYPERMETROPIA, MYOPIA or the meridional visual defect ASTIGMATISM. The state of normal refraction is called emmetropia.ametropia Anomaly of the refractive state of the eye in which, with relaxed accommodation, the image of objects at infinity is not formed on the retina. Thus vision may be blurred. The ametropias are: astigmatism, hyperopia (hypermetropia) and myopia. The absence of ametropia is called emmetropia. Syn. refractive error; error of refraction; refraction (although not strictly correct since this term may also refer to the lack of ametropia). See hyperopic defocus; myopic defocus; refraction; refractive error; biological-statistical theory; emmetropization theory; nativistic theory.
axial ametropia Ametropia due primarily to an abnormal length of the eye while the refractive power is approximately normal (Fig. A8).
refractive ametropia Ametropia due primarily to an abnormal refractive power of the eye while the length is approximately normal. Refractive ametropias can be attributed to either an abnormal radius of curvature of the surfaces of the cornea, or the crystalline lens (curvature ametropia) or to an abnormal index of refraction of one or more of the ocular media (index ametropia). " > Fig. A8 Emmetropia E, axial hyperopia H and axial myopia M. In emmetropia, parallel rays are focused on the retina. In hyperopia, the eye is relatively too short and the principal focus is behind the retinaametropia
Related to ametropia: astigmatism, myopiaWords related to ametropianoun (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopiaRelated Words- ophthalmology
- vision defect
- visual defect
- visual disorder
- visual impairment
- myopia
- nearsightedness
- shortsightedness
- astigmatism
- astigmia
- hypermetropia
- hypermetropy
- hyperopia
- longsightedness
- farsightedness
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