Anecdote: eye exercises and subsequent vision therapy (went to an ophthalmologist out of pocket) were very beneficial for me (someone with mild myopia and no other diagnosed conditions), I'm thankful I did it, and would recommend to everyone, even those without myopia. I had a small reduction in my rx, and many other benefits.

That field didn't exist 30-40 years ago, and it is increasingly common now treating conditions (not myopia) that were previously thought to be non-reversible. But who knows what the future holds.