You may have heard of the eye condition called glaucoma. It's a common cause of blindness—in fact, the second leading cause of blindness in the world.
About 3 million adults in the United States have glaucoma. But only half of them know it, partly because it has no early warning signs. That's why glaucoma is sometimes called "the silent thief of sight."
Andrew Iwach, MD, an ophthalmologist and executive director of the Glaucoma Center of San Francisco, answers the most frequently asked questions about this common but serious condition.
What is glaucoma?
Glaucoma is an eye disease that damages the optic nerve, the connection between your eyes and your brain. The nerve damage is usually due to high amounts of pressure inside the eye. This is either because fluid inside the eye isn't draining well, or too much fluid is being produced.
Am I at risk of developing glaucoma?
You may be more likely to develop glaucoma if you have some of these risk factors:
- Over the age of 60
- Black, Hispanic, or Asian heritage
- Family history of glaucoma
- Elevated eye pressure (which your doctor checks during a routine eye exam)
- Long-term steroid use, such as an inhaler for asthma
- Past eye injury
- Smoking
- Farsightedness or nearsightedness
- Conditions that affect blood vessels, including high blood pressure, diabetes, and migraines
What are the warning signs of glaucoma?
Most people don't notice any symptoms in the early stages of glaucoma. That's why seeing an eye care specialist every year is so important. If you don't get regular eye exams, the first symptom you notice could be loss of vision. Especially affected may be your peripheral vision, or your ability to see out of the corners of your eyes.
How can I help lower the risk of glaucoma?
When you turn 40, be sure to see an ophthalmologist. These eye doctors have an MD or DO after their names, meaning they went to medical school and can diagnose and treat serious eye diseases. Most people see an optometrist for vision tests, but as you get older and more likely to develop a disease, you'll want to start seeing an ophthalmologist.
Don't smoke and keep your blood pressure in check. Follow your healthcare provider’s treatment plan for controlling other conditions, like diabetes. Use safety glasses when doing chores at home, such as yard work.
How is glaucoma treated?
There’s no way to reverse the effects of glaucoma. But certain medications and procedures can slow or stop it from getting worse.
Early stages of glaucoma are usually treated with medicated eye drops. These work by lowering the pressure inside the eye, which can help prevent nerve damage and vision loss. It’s important to use the drops as directed to get the most benefit. Be sure to fill your prescription right away and set an alarm or other reminder for your new daily medication.
Eye doctors can also do surgery to drain extra fluid from inside the eye and relieve pressure. Some providers offer laser procedures at their office. The procedure may need to be repeated, and some people still need eye drops after surgery.
Before you start treatment for glaucoma, be sure to tell your eye doctor about other medical conditions you have or medications you take. For example, tell your eye doctor if you're taking prostaglandins or beta-blockers. Some eye drops contain the same type of drug, and your provider will want to be sure you aren't taking too much.
Sources: National Eye Institute. Glaucoma. Last u... + 1
- National Eye Institute. Glaucoma. Last updated: September 10, 2021.
- The Glaucoma Foundation. Who’s at Risk? Accessed January 14, 2022.
