Tests and Fees
Visual field testing - Covered by Manitoba Health
If you are scheduled for a visual field test, you will be called in by one of our technicians at the beginning of your appointment for this test.
Visual field testing is a way of identifying whether your peripheral or "side" vision and central vision have any blind spots or blank areas. Because your eyes work together and one eye's visual field overlaps partially with the other, you may not be aware of defects unless each eye is tested separately.
On return and follow-up visits, visual field testing will be repeated to see if there are any changes. This test is essential in understanding if your glaucoma is stable or getting worse. Over time, these tests are graphed to show the rate of progression or how fast your glaucoma is changing. This gives very important information in planning your customized treatment plan.
Visual Field Testing Methods
Virtual Reality Visual Field Testing
GEM Clinic is using the newest technology for visual field testing with virtual reality. Overall, patients find this method of testing much easier and faster than the traditional method of placing you head in a dome and testing each eye separately (see below). We still use this traditional method in some cases, but we are using the Olleyes VisuALL virtually reality system for most examinations. It features virtual reality goggles that are place over your head and a clicker to hold in hand. It has a very helpful AI assistant named "Annie" who will tell you exactly how to do the test and let you know how you are doing at every step. Annie can speak over 30 languages and can be customized to your preferred language (as available). The test takes about 3-5 minutes for both eyes. This instrument can be easily sanitized and is portable so even wheelchair bound patients and patients with neck issues do not have to worry about positioning into the machine. If you where a turban or large headdress, the goggles may not fit over this and you may need to be testing with the traditional method or adjust your turban size (if possible).
Traditional Visual Field Testing
The traditional visual field testing is performed by testing each eye separately. Generally, the right eye is tested first, and then the left eye. Your non-tested eye will be patched and you will be seated in front of a dome-shaped machine. Your head will be positioned in a chin rest within the dome. You will be asked to stare at a light straight ahead of you, while other lights are flashed at you from all sides of the dome, one at a time. As you notice these other lights using your side vision, you will need to press a clicking device to tell the machine that you have seen the light. It is important to continue to look straight ahead at the target in front of you and resist the urge to look directly at the other lights. You also need to press the clicking device as soon as you see the other lights. The lights will get dimmer as the test tries to figure out how sensitive your eyes are at picking up light. In this way, most of your peripheral or side vision as well as your central vision are tested. Any blank spots in your vision are mapped out.