Hold a flashing light in your peripheral vision while alternating your gaze between your thumb and a distant point for one minute. The flashing stimulus activates your parietal lobe to improve focus-switching, and you'll notice the difference immediately when you retest.
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Now, it doesn't need to be a super bright flashlight, but it needs to flash enough where you see it out of your peripheral vision. And we're going to hold it below our eyes, flashing into the eyeball area, but not looking directly at it. Now, what this does is this activates part of the parietal lobe, which helps us see things in space. So since we are changing directions from near to far, sometimes the eyes have a hard time functioning because they have a hard time understanding where they are in space. This activates that part of the brain, so we may do this a little bit better now. So we're going to hold this here, we're going to hold the near target right there, and we're going to do the same drill. 3 seconds on the thumb, then 3 seconds in the distance. 3 seconds on the thumb, 3 seconds in the distance. Again, do that for 10 reps or about a minute, and then retest yourself. How quickly can you go back and forth between the 2 targets?