Unless the pressure at the front of the eye is controlled, it can damage the optic nerve and cause vision loss. Although anyone can get glaucoma, some people are at higher risk than others. Everyone over age 60. People with a family history of glaucoma. At first, open-angle glaucoma has no symptoms.
Vision stays normal, and there is no pain.
As glaucoma remains untreated, people may notice that although they see things clearly in front of them, they miss objects to the side and out of the corner of their eye. Without treatment, people with glaucoma may find that they suddenly have no side vision. It may seem as though they are looking through a tunnel. Over time, the remaining forward vision may decrease until there is no vision left. Most people think that they have glaucoma if the pressure in their eye is increased.