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Acute glaucoma refers to a sudden, dangerous rise in eye pressure that threatens the optic nerve, most commonly from angle closure. People experience severe eye pain, headache, halos around lights, and rapid vision blur, sometimes with nausea. The cornea can become cloudy and the pupil mid-dilated. It is an emergency that needs immediate care to preserve sight.
read more about acute glaucoma ...In pupillary block angle closure, the lens bows forward and traps fluid behind the iris, sealing the drainage angle. Certain medicines, dim lighting, and anatomic narrow angles can trigger an attack. Less commonly, inflammation or neovascular membranes obstruct outflow acutely. Risk increases with age, female sex, and hyperopia.
When fluid cannot pass from the posterior to the anterior chamber, pressure builds behind the iris. This pressure pushes the iris forward, closing the drainage angle and rapidly increasing intraocular pressure.
You should see your eye doctor if you notice sudden or persistent changes in your vision such as blurriness, flashes of light, floaters, or eye pain. Redness, swelling, or discharge that does not improve with basic care also warrants a checkup. Even if symptoms seem mild, getting a professional evaluation can help detect problems early and prevent complications. Regular eye exams are also important to monitor your overall eye health and keep your vision clear.
Doctors rapidly lower pressure with drops and oral agents, then perform laser peripheral iridotomy to create a new fluid pathway. The fellow eye is usually treated prophylactically. If pressure remains high, additional laser or surgery is used. Prompt intervention protects the optic nerve from permanent damage.
Sudden severe eye pain, headache, halos, nausea, and vision loss demand same day evaluation. Do not wait for symptoms to fade. Early treatment prevents blindness. Family members should be screened for narrow angles when appropriate.
Follow up includes gonioscopy, pressure checks, and optic nerve imaging. Doctors review medications that could provoke another episode. Education on warning signs helps patients act quickly. Regular monitoring maintains long term stability.
Can glasses fix it? No, pressure control requires medical or laser treatment.
Will attacks recur? Proper laser treatment greatly reduces recurrence.
Is the other eye at risk? Yes, similar anatomy places the fellow eye at risk.
Khazaeni, B., et al. (2023). Acute Angle-Closure Glaucoma. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK430857/
American Academy of Ophthalmology. (2021). Primary Angle-Closure Disease Preferred Practice Pattern®. Ophthalmology. https://www.aaojournal.org/article/S0161-6420%2820%2931023-X/fulltext
EyeWiki. (2023). Drug-induced Acute Angle Closure Glaucoma. American Academy of Ophthalmology. https://eyewiki.org/Drug-induced_Acute_Angle_Closure_Glaucoma
Medscape. (2025). Acute Angle-Closure Glaucoma (AACG). Medscape Reference. https://emedicine.medscape.com/article/1206956-overview
American Academy of Ophthalmology. (2025). Primary Angle-Closure Glaucoma (PACG) – Asia Pacific. American Academy of Ophthalmology. https://www.aao.org/education/topic-detail/primary-angleclosure-glaucoma-pacg--asia-pacific