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Hold the phone at 12 inches and watch the  Image ⬆ : See   1  Bleaching LIGHT, See   2  GREY LIGHT and See   3  grey light turns  WHITE  :Tap, The Endpoint.  That was a sample of what happens. It is that simple, measures both fovea in seconds and the difference in seconds. Scores: 17 seconds per fovea, difference between fovea's 2 seconds or less. When testing try several times to become use of testing. Questions Call 305 389 0928, Get Apple App: MacHealth. https:apps.apple.com/us/app/machealth/id6476466130