Glaucoma is a condition in which the nerve cells which transmit information from the eye to the brain become damaged. With all types of glaucoma, the 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 and often unnoticeable 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. If you have a family history of glaucoma, you are at higher risk of developing glaucoma.