Acute Glaucoma: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Acute Glaucoma?
An ophthalmologist (an eye doctor) treats acute glaucoma. This condition is a medical emergency, so you need care right away when it starts. The ophthalmologist works to lower the pressure inside your eye and protect your vision. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is acute glaucoma?
Acute glaucoma is also called angle-closure glaucoma or narrow-angle glaucoma. It happens when fluid inside the eye cannot drain out normally. The fluid builds up fast and eye pressure rises sharply. Glaucoma is a group of eye diseases that can damage the optic nerve. That nerve sits at the back of the eye and sends the images you see to your brain. High eye pressure can harm this nerve. Acute glaucoma is a medical emergency. Without treatment, it can cause blindness in just a few days.
Symptoms
Symptoms may come and go at first, or steadily become worse. You may notice:
- Sudden, severe pain in one eye.
- Decreased or cloudy vision, often called steamy vision.
- Nausea and vomiting.
- Rainbow-like halos around lights.
- Red eye.
- An eye that feels swollen.
Causes and who gets it
The front of the eye holds a clear fluid called aqueous humor. This fluid leaves the eye through channels where the iris and the cornea meet. The iris is the colored part of the eye. The cornea is the clear covering on the front of the eye. This drain area is called the angle.
In acute glaucoma, the outer edge of the iris blocks fluid from draining out of the front of the eye. The fluid builds up quickly and causes a sudden increase in eye pressure. Dilating eye drops and certain medicines may trigger an acute glaucoma attack. If you have had an attack in one eye, you are at risk for it in the second eye.
How doctors diagnose it
The only way to diagnose glaucoma is with a complete eye exam. The doctor checks your eye pressure with a test called tonometry (a pressure test for the eye). The doctor may also use a special lens to look at the angle of the eye. This test is called gonioscopy. Photographs or laser scanning images can show the inside of the eye and the optic nerve.
Treatment
The goal of treatment is to reduce your eye pressure. An acute angle-closure attack is a medical emergency. You can become blind in a few days if you are not treated.
Doctors may give you eye drops, pills, and medicine through a vein (an IV) to lower your eye pressure. Some people also need an emergency operation, called an iridotomy. The eye doctor uses a laser to open a new channel in the iris. Sometimes this is done with surgery. The new channel relieves the attack and will prevent another attack.
To help prevent an attack in the other eye, the same procedure is often done on the other eye, even if that eye has never had an attack. Laser treatment and medicine can help the fluid drain, lower eye pressure, and protect your vision.
When to see a doctor
Acute glaucoma is a medical emergency. Call 911 or go to the emergency room right away if you suddenly have intense eye pain, an upset stomach (nausea), a red eye, or blurry vision. If you have severe eye pain or a sudden loss of vision, get immediate medical help. These may be signs of closed-angle glaucoma.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. This kind of doctor can check your eye pressure and symptoms and send you for emergency or eye specialist care. They can also follow up after treatment and help coordinate your care.
Common questions
Is acute glaucoma an emergency?
Yes. Angle-closure glaucoma is a medical emergency. You need treatment right away to save your vision. You can become blind in a few days if you are not treated.
Can acute glaucoma affect both eyes?
Yes. If you have had acute glaucoma in one eye, you are at risk for it in the second eye. Your eye doctor is likely to treat your second eye to prevent a first attack in that eye.
What can trigger an acute glaucoma attack?
The attack starts when the outer edge of the iris blocks fluid from draining out of the front of the eye. Eye pressure then rises quickly. Dilating eye drops and certain medicines may trigger an acute glaucoma attack.
How do doctors check for glaucoma?
Doctors use a complete eye exam. They check eye pressure with a test called tonometry. They may also use gonioscopy, which is a special lens to look at the angle of the eye, plus photos or scans of the optic nerve.
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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.
