In Glaucoma the field of vision is the first to be affected. By the time the central vision is affected, glaucoma is already far advanced with almost all peripheral vision permanently lost. That is why glaucoma is called the ‘sneak thief of vision’. When we test vision on an eye-chart, only the central vision gets tested. So reading 20/20 on the eye-chart would mean you have great central vision, but no comments can be made about the peripheral field of vision.
Our office is proud to have two different types of Automated (computerized) field analyzers. The Humphrey FDT and the Humphrey Zeiss are used to perform the field of vision test. A light point or grid pattern is presented in a predetermined fashion (location sequence) in a lighted bowl and the patient is asked to press a button when they see the stimulus. The responses are analyzed statistically and compared with a database of normal responses. Besides Glaucoma numerous conditions such as stroke, other vascular problems, and many neurological conditions can be quickly assessed through Visual Field Testing. Retinal disorders such as Retinitis pigmentosa and Retinal detachment can also be diagnosed and monitored by this powerful technique.
