Primary Angle Closure Glaucoma: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Primary Angle Closure Glaucoma?
An ophthalmologist treats this condition. This medical doctor specializes in eye care and can diagnose angle closure, perform laser treatment, and do surgery. An optometrist can spot warning signs and will refer you to an ophthalmologist if the angle looks narrow.
What it is
Primary angle closure glaucoma is a serious eye disease in which fluid inside the eye cannot drain the way it should. The "angle" is where the iris meets the cornea, the clear front window of the eye. When this angle closes or gets too narrow, eye pressure rises and can damage the optic nerve, causing permanent vision loss.
Symptoms
Some people have a sudden attack, called acute angle closure. This is a medical emergency. Signs include severe eye pain, headache, blurry vision, halos around lights, nausea, vomiting, and a red eye. Vision can drop quickly.
Others have a slow form called chronic angle closure, causing mild headaches, eye discomfort, or blurred vision that comes and goes. Because there is often no pain, many people do not notice it until vision is already damaged.
Causes and who gets it
The main cause is an eye shape that makes the drain too narrow. Some people are born with a shallow angle, and the risk grows with age. It is most common in people over 50, in women, and in people of Asian descent or with a family history.
How doctors diagnose it
An eye doctor checks your eye pressure with a quick, painless test called tonometry and uses a special lens to examine the angle, a test called gonioscopy. The doctor may also examine the optic nerve and test your side vision.
Treatment
The most common treatment is laser iridotomy, in which a laser makes a tiny hole in the iris so fluid can drain normally. Eye drops can lower eye pressure, and surgery may be needed if laser treatment is not enough.
When to see a doctor
Go to an emergency room or call an eye doctor right away if you have sudden eye pain, a severe headache, blurry vision, halos around lights, or vomiting with a red, painful eye. Fast treatment can prevent lasting damage. People over 50 or with a family history of glaucoma should ask about regular eye exams.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can review your symptoms and explain your risk, but will refer you to an ophthalmologist if angle closure is suspected.
Common questions
Is angle closure glaucoma the same as open angle glaucoma?
No. Open angle glaucoma is more common and develops slowly with almost no symptoms. Angle closure can come on suddenly and cause obvious pain. Both raise eye pressure and can damage vision.
Can it be cured?
Laser treatment and surgery can open the drain and lower eye pressure, which usually stops further damage. Vision already lost does not typically return.
Will it affect both eyes?
Often it does. Doctors frequently treat the second eye as a preventive step, even if it has no symptoms yet.
Can medicines cause an attack?
Some medicines, including certain decongestants, antidepressants, and antihistamines, can widen the pupil and trigger an attack in people with narrow angles. Always tell your doctors about every medicine you take.
Sources
- MedlinePlus - Glaucoma
- American Academy of Ophthalmology - Understanding Glaucoma: Symptoms, Causes, Diagnosis, Treatment
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
