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To use this tester, cover the appropriate eye and look only at the circle, but be aware of the cross in your peripheral vision. Move the paper towards or way from you. At a certain distance, usually 8-14 inches from your nose, the cross will disappear.
I call this my “In touch with reality tester”. That’s because we actually think we know a lot. Like when its OK to make war, or if we can safely exceed the speed limit, or when and how to punish our children. Actually, we don’t even know that there is a hole in our vision.
If this doesn't’t make you stop and question EVERYTHING, then god help us all.