Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.


(glôkō`mə), ocular disorder characterized by pressure within the eyeball caused by an excessive amount of aqueous humor (the fluid substance filling the eyeball). This causes pressure against the optic nerve and compression of the blood vessels of the eye—the resulting impairment of vision ranges from slight abnormalities to total blindness. Chronic open-angle glaucoma is the result of impeded drainage of aqueous humor. In acute angle-closure glaucoma, the anterior chamber of the eye is shallower and the iris may obstruct the meshwork at the entrance of the canal of Schlemm. Although glaucoma is a leading cause of blindness in the United States, with timely treatment blindness is almost always avoided.

Chronic glaucoma begins gradually over a period of months or years, usually in patients over the age of 40. There are no symptoms in the early stages, and the condition can be detected only by measurement of the intraocular pressure. Such an examination is recommended every three years for all persons over the age of 20. As the disease progresses, often the only symptom is a gradual loss of peripheral vision. Chronic glaucoma can usually be controlled with eye drops or pills that increase the outflow or decrease the production of aqueous humor; laser treatment is also effective in the early stages. If treatment is continued throughout life, useful vision will be preserved in most cases; untreated individuals will gradually become blind.

Acute closed-angle glaucoma, which accounts for only 10% of the incidence of the disease, begins abruptly with severe pain and blurred vision. It is a medical emergency that causes permanent blindness in two to five days if left untreated. Surgery is usually necessary.



(also called “yellow water” or “green water” in Russian—in glaucoma the region of the pupil sometimes begins to gleam with a yellowish gray or bluish gray light), a disease of the eyes, the principal symptom of which is an increase in intraocular pressure with a reduction of vision.

Intraocular pressure in glaucoma sometimes reaches 80 mm of mercury, or 10.67 kilonewtons (kN)/m2. (Normal pressure is 18-27 mm of mercury, or 2.4-3.6 kN/m2.) The pressure in the eye may rise spontaneously (primary glaucoma) or as the result of a previous or current disease of the eye (secondary glaucoma). The underlying cause of the disease is a disruption of the circulation of intraocular fluid—most commonly, difficulty in its drainage. Glaucoma usually develops in the elderly, often affecting both eyes, and as a rule proceeds chronically; in the absence of systematic treatment it is progressive. Glaucomas may be defined as either congestive (narrow angle), characterized by periodic clouding of vision, rainbowed halos around a light source, and a sensation of pressure in and around the eye, simple (open angle), in which these subjective phenomena are absent. In any form of glaucoma visual acuity gradually diminishes, the field of vision becomes limited, and the optic nerve atrophies. An acute attack of glaucoma, characterized by an abrupt rise in intraocular pressure, may develop at any stage of the disease; severe pains in and around the eye develop, there is reddening of the eyes, edema and clouding of the cornea, dilatation of the pupil, and reduction of vision, sometimes to the point of blindness. There is often accompanying nausea and vomiting. Glaucoma is the most common cause of blindness. The treatment may be medical or sometimes surgical. In the USSR prevention consists of examination of persons over 40 years of age and treatment of patients with established glaucoma at out-patient prevention and treatment clinics. Prevention of blindness from glaucoma involves early diagnosis of the disease and systematic treatment.


Averbakh, M. I. “Glaukoma.” In Oftalmologicheskie ocherki. Moscow, 1949.
Mnogotomnoe rukovodstvo po glaznym bolezniam, vol. 2. [Edited by V. N. Arkhangel’skii.] Moscow, 1960.



A disease of the eye characterized by increased fluid pressure within the eyeball.


a disease of the eye in which pressure within the eyeball damages the optic disc, impairing vision, sometimes progressing to blindness
References in periodicals archive ?
These include those with a history of glaucoma in the family, adults over 35 years of age, African race, high IOP, myopia (shortsightedness) and diabetes mellitus.
Each March, HMC holds free glaucoma screenings and conducts public awareness sessions to highlight World Glaucoma Week, being held this year from 11 to 17 March.
According to a previous study,[15] patients with primary or various secondary open-angle glaucomas as well as narrow angles were included, except neovascular glaucoma and those with postoperative follow-ups <3 months.
Dr Smith pointed out that the most common kind of glaucoma is age-related.
When glaucoma was suspected, visual field testing was done.
Leghari informed that there is no cure for glaucoma as yet, and vision loss is irreversible.
The second most common type is angle-closure glaucoma, where the angle between the iris and cornea is narrow and doesn't permit adequate fluid drainage, resulting in increased IOP Unlike open-angle glaucoma, angle-closure glaucoma develops quickly; symptoms include eye pain, blurred vision, nausea and vomiting, and seeing halos around lights.
Depression, anxiety, and disturbed sleep in glaucoma.
Conclusion: Awareness of glaucoma was quite low among the urban population in Punjab.
The glaucoma epidemiology report is written and developed by Masters- and PhD-level epidemiologists.
The increasing prevalence of eye-related disorders, such as macular degeneration and diabetic retinopathy; the aging population worldwide; and the rising government initiatives towards healthcare infrastructure in developing countries are among the key driving factors for the global ophthalmic ophthalmology glaucoma surgery device market.
The disease have many kinds in which some may occurs as a complication of the other visual disorder which is called secondary glaucoma but majority of the disease happen without any known reason that is called primary.