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This is a test of a patient's peripheral vision (not central)
It is done annually for all Glaucoma patients, and also for people undergoing Ptosis surgery
While looking straight ahead a a fixation light, there will be flashing white lights all around in the periphery. Some will be bright and some dim; that's the point. It is testing what you can see and where
When the patient sees the flashing lights, they click the button in their hand
It is important for the patient to focus on the fixation light at all times, and not move their eye around looking at the flashing lights. This will result in an inaccurate test!
Note
It is imperative that the patient is situated properly during the test and the lens is positioned properly (forehead touching the headrest and their head doesn't drift left or right)
This is what the analysis looks like
The black areas are areas of lost vision
What is the black area in this picture????????
This is called a rim artifact / defect
This is what happens when the lens is too far away from the patient's eye, and/or their forehead is drifting away from the rest
The result is that the rim of the lens is physically blocking the patients vision
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