Glaucoma: An Evidence-Based ApproachAbout This Hardback A glaucoma is a group of eye conditions that damage the optic nerve. It is caused by abnormally high pressure in the eye due to excess fluid. There are several types of glaucoma such as open angle glaucoma, angle closure glaucoma, normal tension glaucoma, pediatric glaucoma and pigmentary glaucoma. A few of the major symptoms of glaucoma are patchy blind spots, tunnel vision, severe headache, eye pain, nausea and vomiting, blurred