this method is absolute snake oil. Google around. Most myopia is axial in nature - in layman terms - your eyeball is just too long. No amount of exercises or staring into the sun is going to reduce its length.
https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom...
dame paper, different links.
The fact that it's geometry is roughly static around a focal length that has sharp focus on the retina is a wonder of homeostasis with at least three known tuning loops:
1) the lens Moving on swiftly...
2) a slower feedback loop adjusting the choriod (hence focal length) in the order of hours.
3) an even slower loop adjusting the eye geometry over longer periods of time.
check out: https://www.sciencedirect.com/science/article/pii/S089662730...