I believe it's based on the eye muscle excercises written about in the EARLY 1900's by (I forget the guys name) to reduce people's dependence on glasses. My friend has a book about it that I haven't had time to read (for obvious reasons) but everything I have read about it ..... save your money.
yes, some of the exercises to work (a little) but you have to do them every single day for quite a length of time.. and you can NEVER stop! I also think it's only really supposed to work on people who are 20/40 or less (So, I'm WAY out) 😉
I'll have to go find a link to my friend's book. I'm sure amazon has it and y'all can read the back cover about the theorys. It is interesting and some day I'll get around to reading it.