Glaucoma

Glaucoma is a group of eye conditions that damage the optic nerve, the health of which is vital for good vision. This damage is often caused by an abnormally high pressure in your eye. Glaucoma is one of the leading causes of blindness for people over the age of 60. It can occur at any age but is more common in older adults. Many forms of glaucoma have no warning signs. The effect is so gradual that you may not notice a change in vision until the condition is at an advanced stage.
The signs and symptoms of glaucoma vary depending on the type and stage of your condition. For example:
Open-angle glaucoma
Patchy blind spots in your side (peripheral) or central vision, frequently in both eyes, Tunnel vision in the advanced stages
Acute angle-closure glaucoma
Severe headache, Eye pain, Nausea and vomiting, Blurred vision, Halos around lights, Eye redness.