Symptoms depend on the type of glaucoma and how advanced it is.

Open-angle glaucoma

• Usually has no symptoms in the early stages.
• Can cause small blind spots, often on the sides of your vision. Sometimes blind spots appear in the center.
• In early stages, it may be harder to see at night or to tell objects apart in low light.
• In later stages, one may have “tunnel vision,” where side vision is lost and only central vision remains.

Angle-closure glaucoma 

• Severe eye pain
• Red or bloodshot eye
• Severe headache
• Nausea or vomiting
• Blurry vision
• Seeing halos or bright rings around lights
• Sudden loss of vision