

Assuming the lenses can be removed and replaced, opticians should be able to cut prescription lenses to fit.
When my wife had her practice, we had a machine that could cut patterns using the frame. Then the pattern is used to cut the lenses. I’m sure it’s even easier today.
I could be wrong, but in the case of Mikayla Raines, the subreddit wasn’t necessarily discussing self harm, but was promoting online harassment which led to suicide.