Glaucoma not a single disease but a group of disorders characterized by a progressive optic neuropathy, leading to a characteristic appearance of the optic disc and a specific pattern of irreversible visual field defects that are associated frequently but not invariably with raised intraocular pressure. The normal range of eye pressure in general population is usually between 10-22 mmHg. Untreated glaucoma leads to permanent damage of the optic nerve and resultant visual field loss, which can progress to blindness.<unk>  is typically a chronic, slowly progressive optic neuropathy
with characteristic patterns of optic nerve damage and visual field loss.
It can be Primary, i.e. without any known underlying etiology or secondary with known underlying etiologies.
Open-angle glaucoma
Graves ophthalmopathy
Cat eye syndrome
Glaucoma
Iridocorneal endothelial syndrome
Dry eye syndrome
Kjer's optic neuropathy
Retinal migraine