Glaucoma is caused when pressure builds up inside the eye, damaging the optic nerve that connects the eye to the brain. If it’s not treated in time, it can cause irreversible blindness.
Primary Open-Angle Glaucoma
Primary open-angle glaucoma is a syndrome of optic nerve damage associated with an open anterior chamber angle and an elevated or sometimes average intraocular pressure (IOP). Symptoms are a result of visual field loss.
Closed-Angle Glaucoma
Angle-closure glaucoma, also called closed-angle glaucoma, occurs when the iris bulges forward to narrow or block the drainage angle formed by the cornea and iris. As a result, fluid can’t circulate through the eye and pressure increases.
Normal-Tension Glaucoma
Most kinds of glaucoma involve elevated eye pressure. Normal-tension glaucoma (NTG), also known as low tension or normal pressure glaucoma is a form of glaucoma in which damage occurs to the optic nerve without eye pressure exceeding the normal range. In general, a “normal” pressure range is between 12-22 mm Hg.