What is a Humphrey Visual Field?
In ophthalmology, Humphrey Visual Fields are administered when diagnosing patients with glaucoma. Glaucoma is known as the “Sneak Thief of Sight” because it eats away at a patient’s peripheral vision first and slowly leaves them with a narrow tunnel of vision. Usually, when beginning as an ophthalmic technician, the Humphrey Visual Field is the first thing taught because it is the easiest to learn. To put it simply, the technician will patch one of the patient’s eyes and have her/her focus his/her vision on a yellow light. During the test, lights will flash in the patient’s periphery and when he/she sees the lights flash, they will click a button.
Your turn to take the test!
Try it out for yourself! Cover one of your eyes and focus the other eye on the bright yellow dot at the top. Count how many times you see a “flash.” However, try not to follow the “flashes” as tempting as it will be. This video is a representation of what the test is and what it looks like inside.