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Ophthalmology. abnormally high fluid pressure in the eye, most commonly caused either by blockage of the channel through which aqueous humor drains (open-angle glaucoma or chronic glaucoma) or by pressure of the iris against the lens, which traps the aqueous humor (angle-closure glaucoma or acute glaucoma)
a disease of the eye in which pressure within the eyeball damages the optic disc, impairing vision, sometimes progressing to blindness
1640s, from Greek glaukoma “cataract, opacity of the lens” (cataracts and glaucoma not distinguished until c.1705), from -oma + glaukos, an adjective of uncertain origin (see glaucous).
angle-closure glaucoma n.
Primary glaucoma in which increased pressure occurs because outflow of the aqueous humor is mechanically prevented by contact of the iris with the trabecular drainage meshwork and the peripheral cornea. Also called narrow-angle glaucoma.
glaucoma glau·co·ma (glou-kō’mə, glô-)
Any of a group of eye diseases characterized by abnormally high intraocular fluid pressure, damaged optic disk, hardening of the eyeball, and partial to complete loss of vision.
glau·co’ma·tous (-kō’mə-təs) adj.
A disease of the eye in which the pressure of fluid inside the eyeball is abnormally high, caused by obstructed outflow of the fluid. The increased pressure can damage the optic nerve and lead to partial or complete loss of vision.
glaucoma [(glow-koh-muh, glaw-koh-muh)]
A disease of the eye marked by increased fluid pressure in the eyeball. Glaucoma can damage the optic nerve and may result in blindness if not treated. Surgery may be required for severe cases.
- Angle collar
. a collar formed of angle iron surrounding a structural member passing through a deck or bulkhead to make a seal that is watertight, oiltight, etc. stapling sta·pling (stā’plĭng) n. The fastening together of two tissues with a staple or staples.
- Angle of deviation
the angle equal to the difference between the angle of incidence and the angle of refraction of a ray of light passing through the surface between one medium and another of different refractive index. noun the angle between the direction of the refracted ray and the direction of the incident ray when a ray of […]
- Angle of depression
- Angle dip
to plunge (something, as a cloth or sponge) temporarily into a liquid, so as to moisten it, dye it, or cause it to take up some of the liquid: He dipped the brush into the paint bucket. to raise or take up by a bailing, scooping, or ladling action: to dip water out of a […]