The First Step: Determine the Type of Glaucoma
Gradual Peripheral Vision Loss
Gradual reduction of peripheral vision without other symptoms can indicate primary open-angle glaucoma (POAG), in which drainage of fluid from the eye is constricted, but not completely blocked.
Sudden Pain and Visual Distortion
The sudden onset of symptoms such as eye pain, headaches, halos around lights, dilated pupils, and nausea can indicate acute angle-closure glaucoma, in which drainage becomes completely blocked.
Vision Loss with Normal IOP
Vision loss caused by damage to the optic nerve while IOP remains within a normal range can indicate normal-tension glaucoma.