It's highly debatable that you can fix eyes like that. Optometry developed historically as a practice of prescribing eye exercises for "vision therapy," but mos

It's highly debatable that you can fix eyes like that. Optometry developed historically as a practice of prescribing eye exercises for "vision therapy," but most optometrists these days measure refractions to fit corrective eyeglasses to their patients, just like ophthalmologists. I know several people, a few of them quite closely, who have convinced themselves that they are improving their vision by eye exercises or by refraining from using prescribed corrective eyeglasses, but what they are mostly doing is kidding themselves as they go through life with needlessly blurred vision. The way to be sure whether or not eyes can be fixed like that is to set up an experiment with random assignment to treatment and control groups, and to have investigators who are "blind" (an unfortunately coincidental word in this context) to each subject's assignment to this or that group test their vision carefully. I confidently predict that any treatment effects found in such a study with the methods you read about on Reddit will be of small effect, of brief duration, and obtained at more trouble than the improvement in vision that comes from wearing prescribed corrective lenses.