Glaucoma is a group of eye diseases that cause damage to the optic nerve which can progress to complete vision loss. The optic nerve is like an extension cord from our eye to our brain. The most common type of glaucoma is open-angle glaucoma. In early stages, there are no visual symptoms. The condition begins by affecting peripheral vision which leads to tunnel vision and in advance stages, complete vision loss. Angle-closure glaucoma is characterized by pain, nausea, and sudden vision loss. Although rare, it is a medical emergency. Since there is no cure for glaucoma, early detection is essential to slow progression. Age, race, family, and medical history are all factors that can increase your chances of glaucoma. However, anyone can develop it. Treatment can include pressure reducing eye drops, medications, and surgery.