Why treat pressure if my pressure is normal?

The optic nerve may still be sensitive to that pressure. Lowering pressure further slowed worsening in a normal-tension glaucoma study [1] .

Will normal-tension glaucoma make me blind?

Most treated people keep useful vision. The main risks are late diagnosis, missed visits, and disease that keeps worsening.

They can be part of the risk picture. Tell your glaucoma doctor about migraines, fainting, sleep apnea, or very low blood pressure.

No. Treatment can slow future damage, but it cannot restore vision already lost from glaucoma.

Condition

Also known as Low-Tension Glaucoma, Normal-Pressure Glaucoma, NTG, Low-Pressure Glaucoma, Open-Angle Glaucoma With Normal Pressure

Updated May 16, 2026·For educational purposes only. Not a substitute for medical advice. See our terms.

Bottom Line

Normal-tension glaucoma damages the optic nerve even when eye pressure is not high. Treatment lowers pressure further and watches the nerve closely.

Normal-tension glaucoma is a type of open-angle glaucoma. The optic nerve has glaucoma damage, but measured eye pressure stays in the normal range ¹.

Most people do not feel it at first. Side vision can fade slowly, so regular optic nerve exams and side vision tests are important ².

Lowering eye pressure still helps. In a major normal-tension glaucoma study, eyes treated to lower pressure were less likely to worsen ¹.

Normal-tension glaucoma is diagnosed with several tests together:

Eye pressure. The number is not high, but it is still recorded over time.
Optic nerve exam. The doctor looks for cupping, rim thinning, and disc bleeding.
Side vision test. This finds blind spots you may not notice.
Nerve scan. Imaging measures nerve fiber thinning.
Cornea thickness. Thin corneas can make pressure readings look lower than they are.

Doctors also look for other causes of optic nerve damage before calling it normal-tension glaucoma ².

Treatment aims to lower eye pressure below your usual number. This can protect the optic nerve even when pressure started in the normal range ¹.

Eye drops. Drops lower pressure by reducing fluid or helping it leave the eye.
Laser trabeculoplasty. Laser can help the eye drain fluid better.
Surgery. Surgery is used when the nerve worsens despite drops or laser.
Health review. Your doctor may ask about sleep apnea, fainting, migraines, or very low nighttime blood pressure.

Lost vision usually cannot return. The goal is to protect the vision you still have.

Small habits help long-term control:

Use drops on schedule. Set a phone alarm if needed.
Bring drops to each visit. Your doctor can check the bottle and technique.
Ask for your target pressure. Your target may be lower than a standard normal number.
Keep testing visits. Nerve scans and side vision tests catch slow change.
Tell relatives. Close family members may need glaucoma exams.

Yes. Normal-tension glaucoma means the optic nerve has glaucoma damage even though pressure readings are not high.

1Book a glaucoma exam if you have optic nerve changes or a family history.
2Ask for your eye pressure, target pressure, nerve scan, and side vision results.
3Use prescribed drops every day unless your doctor changes the plan.
4Tell your doctor about migraines, sleep apnea, fainting, or very low blood pressure.

Board-certified ophthalmologists who treat Normal-Tension Glaucoma.

Also relevant