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glaucoma

glaucoma (glaw-ko´ma)

A disease of the eye characterized by increased intraocular pressure, excavation, and atrophy of the optic nerve; produces defects in the field of vision. [G. glaukoma, opacity of the crystalline lens, fr. glaukos, bluish green]
absolute g. the final stage of blindness in g.
acute g. angle-closure g
angle-closure g. primary g. in which contact of the iris with the peripheral cornea excludes aqueous humor from the trabecular drainage meshwork.acute g., closed-angle g., narrow-angle g;
aphakic g. g. following cataract removal.
capsular g. g. occurring in association with widespread deposition of cellular organelles on the lens capsule, ocular blood vessels, iris, and ciliary body. See also pseudoexfoliation of lens capsule.
chronic g. open-angle g
a-chymotrypsin-induced g. transient secondary g. following the use of a-chymotrypsin in cataract extraction.
closed-angle g. angle-closure g
combined g. g. with angle-closure and open-angle mechanisms in the same eye.
compensated g. open-angle g
congenital g. buphthalmia
corticosteroid-induced g. g. caused by a hereditary predisposition in which local instillation of eyedrops containing corticosteroid causes increased intraocular pressure.
Donders' g. obsolete eponym for open-angle g.
g. ful´minans acute angle-closure g. rapidly followed by blindness.
ghost cell g. g. occurring after vitrectomy, arising from erythrocyte membranes blocking outflow channels of aqueous humor.
hemorrhagic g. secondary g. after formation of new blood vessels in the iris.
hypersecretion g. g. caused by excessive formation of the aqueous humor.
low tension g. optic nerve atrophy and excavation with typical field defects of g. but without abnormal increase in intraocular pressure.
malignant g. secondary g. caused by forward displacement of the iris and lens, obliterating the anterior chamber; usually follows a filtering operation for primary glaucoma.
narrow-angle g. angle-closure g
neovascular g. g. occurring in rubeosis iridis.
open-angle g. primary g. in which the aqueous humor has free access to the trabecular meshwork.chronic g., compensated g., simple g., g. simplex;
phacogenic g. phacomorphic g
phacolytic g. g. secondary to hypermature cataract and occlusion of the trabecular drainage meshwork by lens material.
phacomorphic g. secondary g. caused by either excessive size or spherical shape of the lens.phacogenic g;
pigmentary g. g. associated with erosion of pigment from the posterior iris, and with an accumulation of pigment particles in the trabecular meshwork.
pseudoexfoliative capsular g. secondary g. incident to a degenerative cyclitis producing deposits on anterior lens capsule.
pupillary block g. g. secondary to failure of the aqueous humor to pass through the pupil to the anterior chamber.
secondary g. g. occurring as a sequel of preexisting ocular disease or injury.
simple g. , g. sim´plex open-angle g

 

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