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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. When testing try several times to become use of testing. Questions Call 305 389 0928