Regular and appropriate diagnostic examinations by an ophthalmologist are the key to preventing loss of vision due to glaucoma. Ophthalmologists are medical doctors who are specialists in eye care that are trained to examine and treat eye diseases. Although there is currently no way to reverse optic nerve damage, if glaucoma is diagnosed and treated early blindness is almost always preventable. The most important issue in preventing blindness from glaucoma is early detection before the vision is seriously threatened. Appropriate treatment can then prevent further damage.