Glaucoma is a condition in which pressure created by the fluid inside the eye reaches an abnormally high level. If this pressure remains high, it may cause damage to the optic nerve head and may result in loss of vision. The most common form of glaucoma is chronic glaucoma. It generally affects both eyes, with symptoms appearing only at an advanced stage, namely when a reduction in the field of vision becomes apparent.

A series of digital photos of the optic nerve head are taken periodically and analyzed using an advanced computerized system. This allows the ophthalmologist to detect minute changes that might not be otherwise noticed during a regular ophthalmic exam.

This test is designed to verify the central and peripheral fields of vision and to determine if there are any abnormalities. It should be repeated regularly and the results analyzed and compared to previous tests, in order to detect any deterioration in the visual field. Ongoing treatment might be modified according to the result of the test.