Myopia is Mental
Myopia is Mental is a vision improvement method created by Mark Warren.
An emphasis on peripheral vision is very good for relaxing the eyeball, and reduces tunnel vision in many cases.
The method has existed for less than a year (as of start of 2020) and lacks many of the details to improve vision in the majority of adherents, in the long term. Due to a reliance on clear flashes, although some might have good results with it, the effect may be hard to reproduce consistently across many people. It also ignores the scientific consensus that myopia is caused by a longer axial length of the eyeball, and is not purely a psychological effect.
Do feel free to give it a go. Make your own mind up - be skeptical and avoid Blind belief. We'll still be here if you decide to come back.