Normal-tension Glaucoma

normal-tension glaucoma

Normal-tension glaucoma is a form of glaucoma where the optic nerve becomes damaged and visual field loss occurs even though measured eye pressure stays within the normal range. People with this condition show the same characteristic optic nerve changes and vision loss as other types of glaucoma, but they do not have elevated intraocular pressure by standard office measurements. Because pressure readings look normal, this condition can be harder to recognize unless someone examines the optic nerve and tests visual fields carefully. Researchers think blood flow problems and vulnerability of the optic nerve may play a larger role in this condition than in pressure-driven glaucoma. Factors such as low blood pressure, poor vascular regulation, sleep-time dips in pressure, and certain vascular disorders may contribute to optic nerve damage. Diagnosis typically involves detailed eye exams, optic nerve imaging, visual field testing, and sometimes 24-hour monitoring to catch pressure or blood flow changes. Treatment still aims to protect the optic nerve, and lowering eye pressure further than normal can slow progression for many patients. Doctors may also address systemic vascular issues, adjust blood pressure medications if needed, and consider lifestyle changes to improve blood flow. Because vision loss from glaucoma is irreversible, early detection and careful monitoring are important to preserve sight. Normal-tension glaucoma matters because people can lose vision despite having what looks like a normal eye pressure, so relying on pressure measurements alone is not enough.