- astigmatic lens
- cylindrical l.
Medical dictionary. 2011.
astigmatic lens
Look at other dictionaries:
Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil … Medical dictionary
astigmatic — astigmatism ► NOUN ▪ a defect of the eye or a lens, resulting in distorted images. DERIVATIVES astigmatic adjective. ORIGIN from Greek stigma point … English terms dictionary
astigmatic — as·tig·mat·ic || ‚æstɪg mætɪk adj. pertaining to astigmatism (unequal curvature of the lens of the eye creating a distorted image) … English contemporary dictionary
astigmatic — adjective of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images • Ant: ↑anastigmatic • Derivationally related… … Useful english dictionary
Intraocular lens — An intraocular lens (IOL) is an implanted lens in the eye, usually replacing the existing crystalline lens because it has been clouded over by a cataract, or as a form of refractive surgery to change the eye s optical power. It usually consists… … Wikipedia
Corrective lens — A bifocal corrective eyeglass lens A pair of contact le … Wikipedia
Large format lens — Large format lenses are photographic optics that provide an image circle large enough to cover large format film or plates. Large format lenses are typically used in large format cameras and view cameras.Photographic optics generally project a… … Wikipedia
cylindrical lens — a lens used to correct astigmatism, having one plane surface and one cylindrical, or one spherical surface and one toroidal. The meridian along the lens axis has no refractive power, but the meridian at right angles to the axis has maximum… … Medical dictionary
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… … Wikipedia
camera — Synonyms and related words: Iconoscope, Kodak, Photostat, SLR, X ray machine, achromatic lens, aerial reconnaissance camera, astigmatic lens, astrograph, box camera, burning glass, camera obscura, candid camera, cinematograph, coated lens, color… … Moby Thesaurus
