Normal-Tension Glaucoma
Normal-tension glaucoma, also called low-tension glaucoma, is optic nerve damage and vision loss that occur even though eye pressure stays within the normal range — which is why it's easy to miss on a routine pressure check alone.
What it is
Normal-tension glaucoma, also called low-tension glaucoma, is optic nerve damage and vision loss that occur even though eye pressure stays within the normal range — which is why it's easy to miss on a routine pressure check alone.
Symptoms and warning signs
As with other forms of glaucoma, typically none early on — gradual peripheral vision loss that goes unnoticed until advanced.
Causes / risk factors
Not fully understood, though reduced blood flow to the optic nerve is thought to play a role. More common in people with certain vascular conditions.
How it's diagnosed
Since pressure alone won't flag normal-tension glaucoma, diagnosis relies more heavily on OCT imaging of the optic nerve and visual field testing, alongside a full clinical assessment. Because reduced blood flow is thought to play a role, evaluation often also includes a vascular workup — a sleep study to check for obstructive sleep apnea, carotid Doppler to assess blood flow through the neck arteries, and a 2D echocardiogram to assess heart function — since conditions affecting blood flow and oxygen supply can contribute to this type of optic nerve damage.
Treatment approach
Lowering eye pressure further is still the main treatment, even though it's already "normal" — some optic nerves are simply more vulnerable at pressures that would be safe for another eye. Drops, laser, or surgery, depending on severity.
Frequently asked questions
Reach Puja Eye Hospital to request an appointment with Dr. Puja Sheth.