ASTIGMATISM
\ɐstˈɪɡmətˌɪzəm], \ɐstˈɪɡmətˌɪzəm], \ɐ_s_t_ˈɪ_ɡ_m_ə_t_ˌɪ_z_ə_m]\
Definitions of ASTIGMATISM
- 2006 - WordNet 3.0
- 2011 - English Dictionary Database
- 2010 - Medical Dictionary Database
- 1919 - The Winston Simplified Dictionary
- 1898 - Warner's pocket medical dictionary of today.
- 1919 - The Concise Standard Dictionary of the English Language
- 1846 - Medical lexicon: a dictionary of medical science
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
Sort: Oldest first
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(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
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(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
By Princeton University
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(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
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(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
By DataStellar Co., Ltd
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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)
By DataStellar Co., Ltd
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A defect in the structure of the eye because of which the rays of light do not focus in a point on the retina.
By William Dodge Lewis, Edgar Arthur Singer
By William R. Warner
By James Champlin Fernald
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A state of irregular refraction in the eye, in which the rays are not brought to one focus, but converge at different distances, so as to form two linear images at right angles to each other.
By Robley Dunglison
By Willam Alexander Newman Dorland
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A state of irregular refraction of an eye, usually congenital, in which the rays of light diverging from a single point can not be brought to a focus at a point on the retina; an asymmetrical condition of refraction of the different meridians of the eye.
By Smith Ely Jelliffe
Word of the day
basidiomycota
- comprises fungi bearing the spores on basidium: Gasteromycetes (puffballs); Tiliomycetes (comprising orders Ustilaginales (smuts) and Uredinales (rusts)); Hymenomycetes (mushrooms; toadstools; agarics; bracket fungi); in some classification systems considered a division of kingdom comprises fungi bearing spores on a basidium; includes Gasteromycetes (puffballs) Tiliomycetes comprising the orders Ustilaginales (smuts) and Uredinales (rusts) Hymenomycetes (mushrooms, toadstools, agarics bracket fungi).