| cataract | <ophthalmology> An ocular opacity, partial or complete, of one or both eyes, on or in the lens or capsule, especially an opacity impairing vision or causing blindness. The many kinds of cataract are classified by their morphology (size, shape, location) or aetiology (cause and time of occurrence). Origin: L. Cataracta, from Gr. Katarraktes = waterfall, floodgate, portcullis (18 Nov 1997) |
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| cataract extraction | <ophthalmology> The surgical removal of a cataract from the eye to improve vision. An artificial intraocular lens may then be implanted. Approximately 10 weeks are required for complete recovery and healing. (16 Mar 1998) |
| cataract lens | Any lens prescribed for aphakia. (05 Mar 2000) |
| cataract needle | A very narrow, needle-pointed knife used in discission of a cataract. Synonym: cataract needle. (05 Mar 2000) |
| cataract-oligophrenia syndrome | <syndrome> A rare neurologic disorder characterised by cerebellolental degeneration with mental retardation; autosomal recessive inheritance. Synonym: cataract-oligophrenia syndrome, Marinesco-Sjogren syndrome, Torsten Sjogren's syndrome. (05 Mar 2000) |
| cataract spoon | A small concave instrument for removing a cataractous lens. (05 Mar 2000) |
| mature cataract | A cataract in which both the nucleus and cortex are opaque. Synonym: complete cataract, ripe cataract. (05 Mar 2000) |
| glassworker's cataract | A cataract secondary to absorption of heat by the lens, or by transmission from the adjacent iris. Synonym: furnacemen's cataract, glassworker's cataract. (05 Mar 2000) |
| glaucomatous cataract | A nuclear opacity usually seen in absolute glaucoma. (05 Mar 2000) |
| central cataract | Congenital cataract limited to the embryonic nucleus. (05 Mar 2000) |
| cerulean cataract | A congenital cataract with bluish colouring and radial lesions; appears to be at least sometimes autosomal dominant. (05 Mar 2000) |
| membranous cataract | A secondary cataract composed of the remains of the thickened capsule and degenerated lens fibres. (05 Mar 2000) |
| perinuclear cataract | A lamellar cataract in which the nucleus is clear but is surrounded by a ring of opacity. (05 Mar 2000) |
| peripheral cataract | A cataract in which the opacity affects the cortex of the lens. Synonym: peripheral cataract. (05 Mar 2000) |
| gray cataract | A cataract of gray colour, usually seen in senile, mature, or cortical cataract. (05 Mar 2000) |