Glaucoma is a condition of the eye in which the optic nerve is damaged due to increased fluid pressure in the eye. Left untreated the condition may lead to permanent blindness. The disease is usually picked up during a routine eye test often before it causes any noticeable symptoms. Other tests are needed afterwards to diagnose and monitor the condition. The purpose of glaucoma screening tests is to detect patients with early stage disease so that they can be treated to reduce the risk of visual