Perimetry helps evaluate sensitivity of the eyes and the scope of peripheral vision. It is mainly designed to assess the magnitude of damage done to the deep nerve fibers in people with glaucoma but it may also be used with alternative problems. There are multiple tests to assess ones visual field and the physician will assign you with the one most appropriate for you.
The patient will rest their chin on a special support and look at flashing lights on a screen. The flashes may be of different intensities and will appear in different places in your visual perimeter. When the patient sees a flash they must record it by pressing a button. The machine will check different spots multiple times to correct for error.
Usually the test lasts for 5-7 minutes but it may vary slightly
You may wear your contact lenses during the test but if other examinations have been scheduled for the same day we recommend that you wear spectacles instead. If you use reading glasses please bring them with you.