Glaucoma: Clinical Considerations and Management TechniquesAbout This Hardback Glaucoma is a group of eye diseases which causes damage to the optic nerve and leads to vision loss. Open angle glaucoma, closed angle glaucoma, and normal tension glaucoma are the different types of glaucoma. Open angle glaucoma develops slowly over time and does not cause any pain. Peripheral vision starts to decrease at the onset, followed by the central vision. It results in blindness if left untreated. Closed angle glaucoma