What is normal tension glaucoma?

What is normal tension glaucoma?

• A. Glaucoma with high intraocular pressure
• B. Glaucoma with acute angle-closure
• C. Glaucoma associated with retinal detachment
• D. Glaucoma with optic neuropathy despite normal IOP, suggesting vascular/optic nerve susceptibility

Answer: (D)

Normal tension glaucoma is glaucoma where optic nerve damage and visual field loss occur even though the intraocular pressure stays in the normal range. The idea is that the optic nerve is more vulnerable to damage under normal pressures—often due to factors affecting blood flow or vascular regulation to the optic nerve—so damage happens without the high pressure typically seen in other forms of glaucoma. Clinically, you look for glaucomatous changes on the optic nerve (like rim thinning and cupping) and corresponding visual field loss, while repeatedly measuring IOP to confirm it remains within the normal range. Management aims to lower the pressure further to protect the nerve, because lowering even normal levels can slow progression when susceptibility is high. The other descriptions don’t fit this pattern: high IOP points to other glaucomas, an acute angle-closure situation is a sudden, painful spike in pressure, and retinal detachment is a different retinal condition altogether.

Normal tension glaucoma is glaucoma where optic nerve damage and visual field loss occur even though the intraocular pressure stays in the normal range. The idea is that the optic nerve is more vulnerable to damage under normal pressures—often due to factors affecting blood flow or vascular regulation to the optic nerve—so damage happens without the high pressure typically seen in other forms of glaucoma. Clinically, you look for glaucomatous changes on the optic nerve (like rim thinning and cupping) and corresponding visual field loss, while repeatedly measuring IOP to confirm it remains within the normal range. Management aims to lower the pressure further to protect the nerve, because lowering even normal levels can slow progression when susceptibility is high. The other descriptions don’t fit this pattern: high IOP points to other glaucomas, an acute angle-closure situation is a sudden, painful spike in pressure, and retinal detachment is a different retinal condition altogether.