\kˈatɐɹˌakt], \kˈatɐɹˌakt], \k_ˈa_t_ɐ_ɹ_ˌa_k_t]\
Definitions of CATARACT
- 2006 - WordNet 3.0
- 2011 - English Dictionary Database
- 2010 - New Age Dictionary Database
- 1913 - Webster's Revised Unabridged Dictionary
- 2010 - Medical Dictionary Database
- 1919 - The Winston Simplified Dictionary
- 1920 - A practical medical dictionary.
- 1898 - Warner's pocket medical dictionary of today.
- 1899 - The american dictionary of the english language.
- 1894 - The Clarendon dictionary
- 1919 - The Concise Standard Dictionary of the English Language
- 1914 - Nuttall's Standard dictionary of the English language
- 1874 - Etymological and pronouncing dictionary of the English language
- 1846 - Medical lexicon: a dictionary of medical science
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
- 1871 - The Cabinet Dictionary of the English Language
- 1790 - A Complete Dictionary of the English Language
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By Princeton University
By DataStellar Co., Ltd
By Oddity Software
By Noah Webster.
By DataStellar Co., Ltd
By William Dodge Lewis, Edgar Arthur Singer
By Stedman, Thomas Lathrop
By William R. Warner
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald
By Nuttall, P.Austin.
By Stormonth, James, Phelp, P. H.
A deprivation of sight, which comes on as if a veil fell before the eyes. Cataract consists in opacity of the crystalline lens or its capsule, which prevents the passage of the rays of light, and precludes vision. The causes are obscure. Diagnosis.-The patient is blind, the pupil seems closed by an opake body, of variable colour, but commonly whitish: - the pupil contracting and dilating. Cataracts have been divided, by some, into spurious and genuine. The former, where the obstacle to vision is between the capsule of the lens and the uvea: the latter, where it is in the lens or capsule. A lenticular cataract is where the affection is seated in the lens ;-a capsular or membranous, in the capsule. The capsular is divided again, by Beer, into the anterior, posterior, and complete capsular cataract. When the capsule is rendered opake, in consequence of an injury, which cuts or ruptures any part of it, it thickens, becomes leathery, and has been called Catarac'ta arida siliquo'sa. Catarac'ta Morgagnia'na lactea seu purifor'mis is the milky variety, in which the crystalline is transformed into a liquid similar to milk, (F.) Cataracte laiteuse; or, as generally defined, in which there is opacity of the fluid situate between the lens and its capsule. The cap'sulo-lentic'ular affects both lens and capsule, (Achrystallodiaphanie, Adiaphanis perichrystaltique-Piorry,) and Beer conceives the liquor Morgagni, in an altered state, may contribute to it. Cataracts are also called hard, soft (Phacomala'cia,), stony, (F. pierrense,) milky or cheesy (laiteuse ou caseuse,), Galactocatarac'ta, Catarac'ta lactic'olor, according to their density :-white, pearly, yellow, brown, gray, green, black, (F.) blanche, perlee, jaune, brune, grise, verte, noire, according to their colour: -fixed or vacillating-catarac'ta capsulo-leuticula'ris fixa vel trem'ula, (F.) fixe ou branlante, according as they are fixed or movable behind the pupil. They are likewise called Catarac'tae marmora'ciae, fenestra'tae, stella'tae, punctu'tae, dimidia'tae, &c., according to the appearances they present. They may be simple, or complicated with adhesion, amaurosis, specks, &c.; and primary or primitive, when opake before the operation ;-secondary, when the opacity is the result of the operation. The following classification of cataracts is by M. Desmarres: Cataract is commonly a disease of elderly individuals, although, not unfrequently, congen'ital. It forms slowly; objects are at first seen as through a mist; light bodies appear to fly before the eyes, and it is not until after months or years that the sight is wholly lost. No means will obviate the evil except an operation, which consists in removing the obstacle to the passage of the light to the retina. Four chief methods are employed for this purpose. 1. Couching or Depression, Hyalonix'is, Hyalonyx'is, (F.) Abaissement, Deplacement de la Cataracte. This consists in passing a cataract needle through the sclerotic and subjacent membranes, a little above the transverse diameter of the eye; and at about two lines' distance from the circumference of the transparent cornea, until the point arrives in the posterior chamber of the eye. With this the crystalline is depressed to the outer and lower part of the globe of the eye, where it is left 2. By absorption,-by the French termed broicment or bruising. This is performed in the same manner as the former; except that, instead of turning the crystalline from the axis of the visual rays, it is divided by the cutting edge of the needle, and its fragments are scattered in the humours of the eye, where they are absorbed. 3. By extraction, which consists in opening, with a particular kind of knife, the transparent cornea and the anterior portion of the capsule of the crystalline; and causing the lens to issue through the aperture. Each of the processes has its advantages and disadvantages, and all are used by surgeons. 4. Some, again, pass a cataract needle through the transparent cornea and pupil to the crystalline, and depress or cause its absorption. This is called Ceratonyxis. See, also, Reclination.
By Robley Dunglison
By Willam Alexander Newman Dorland
By Smith Ely Jelliffe