Myopia (shortsightedness) is a fairly big one.
The cure’s been so ingrained that the anti-medicine/eugenics people don’t think about their own glasses when posting.
You can just go get your eyes tested, some glasses fitted, and you’re done. Repeat if it gets worse.
If you want something more permanent, you can get someone to slice open your eye, blast it a bit with a laser, and in theory, you would be completely cured, as if you never needed glasses.
If the insurance company declines a patient’s treatment, citing that they believe it to be unnecessary, against the recommendations of their healthcare provider, is that a non-medical decision, then?