What does glaucoma mean?
Glaucoma is a medical term for a group of eye disorders that damage the optic nerve, the nerve carrying visual information from the eye to the brain. The condition is often associated with elevated pressure inside the eye, although it can also occur when that pressure is normal. If left untreated, it may progressively damage peripheral vision, and some people do not notice symptoms until substantial loss has occurred. Open-angle glaucoma is the most common form, while angle-closure glaucoma is generally more acute and can produce pain, blurred vision, nausea, or a red eye. The word is used mainly in clinical and educational contexts, especially in diagnosis, screening, and treatment. Glaucoma cannot currently be cured, but timely treatment can help preserve vision, which has made regular eye testing and early detection particularly important. It should not be confused with a cataract, which is clouding of the eye's lens rather than direct damage to the optic nerve.
nounA group of eye disorders that damage the optic nerve, often associated with abnormally high intraocular pressure and potentially causing progressive loss of peripheral vision.
- A group of eye disorders characterized by damage to the optic nerve, frequently associated with raised pressure inside the eye and progressive loss of vision.
"Early detection can slow the vision loss caused by glaucoma."
"Early detection can slow the vision loss caused by glaucoma."
"The ophthalmologist explained that open-angle glaucoma may develop without noticeable symptoms."
The plural is grammatically standard but uncommon in general medical writing, where “types of glaucoma” is often more natural.
"The clinic specializes in treating advanced glaucomas that have progressed despite medication."
Glaucoma can steal sight gradually and without pain, which is why regular eye examinations are so important.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does glaucoma come from?
The word comes from the Greek γλαύκωμα (glaukōma), an old term for an eye disorder, ultimately derived from γλαυκός (glaukós), meaning “blue-green” or “gleaming.” The Greek term was historically associated with the altered appearance of an affected eye. The English medical word entered use in the late 16th century and later came to designate the group of optic-nerve disorders now called glaucoma.
Related word forms
How glaucoma is actually used
This is a medical and generally formal term. It names a group of related disorders rather than a single disease; the countable plural is uncommon in ordinary clinical writing.
Easily confused with glaucoma
Glaucoma damages the optic nerve and may gradually reduce peripheral vision, whereas a cataract is clouding of the eye's natural lens.