Glaucoma is a illness of the optic nerve. The optic nerve obtains light from the retina and sends impulses to the cerebrum that we perceive as vision. Glaucoma is characterized by a particular pattern of progressive failure to the optic nerve that generally begins with a slowly loss of side vision. If glaucoma is not diagnosed and cured, it can leads to loss of central vision and blindness. Unluckily, the initial symptoms of glaucoma are not known.Glaucoma is divided roughly into two main classses, "open angle" and "closed angle" glaucoma. Closed angle glaucoma can appear unexpectedly and is often painful; visual loss can progress quickly but the discomfort often leads people to look for medical attention before permanent damage occurs. Open angle, chronic glaucoma used to progress at a slower rate and the person may not notice that they have lost vision until the disease has progressed badly.To get more news about this disease please visit my site.