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 the eye. Glaucoma is one of the leading causes of blindness for people over the age of 60, A group of eye conditions that can cause blindness. With all types of glaucoma, the optic nerve connecting the eye to the brain is damaged, usually due to high eye pressure.

The most common type of glaucoma (open-angle glaucoma) often has no symptoms other than slow vision loss. Angle-closure glaucoma, although rare, is a medical emergency and its symptoms include eye pain with nausea and sudden visual disturbance.
Treatment includes eye drops, medication and surgery. It is best to diagnose by OCT. In addition other test have been used to diagnose Glaucoma which are not as sensitive as OCT.