Thats what I tend to call it, I think that it is a way to make your eyes stronger.
The concept is that the mucels in your eyes are like your arms or shoulders...we go to the gym to make our arms stronger, but most peoples eyesight becomes more and more weak. Traditionaly the answer has been to get stronger cruches (glasses)
https://en.wikipedia.org/wiki/Bates_method
The first picture is of pinhole glasses, the way that I think of them is: our eyes are like video cameras, sometimes a video camera will focous on an object near you while suronding objects are less than clear. When a person wears pinhole glasses there eyes automaticly want to focous on the "grid" that is right in front of us, but GOD designed the human body in an amazing way and our minds can tell our eyes what to focous on. so with concentration a person can watch t.v. with the pinhole glasses on and the "autofocous" that GOD put in our eyes will get a workout! :)