From what the ophthalmologist was telling me (and this is my own layman’s understanding of it, which may or may not have a lot do with what he actually said), basically the poor vision is a result of a distortion in the eye. I have a very large ocular cavity, so my eyes were sort of distorted and stretched out inside the space (the football shape they always talk about), which caused issues with the retina apart from the myopia itself.
It sounds like there’s a fair amount of latitude in terms of what doctors can get covered by insurance (considering it’s freaking vision), so it’s definitely worth looking into.