I you make your own, there is no risk for blindness. Blindness comes from methanol, not ethanol. If you use a yeast based process to produce the alcohol and then distill it, there is no way to accidentally produce methanol in that process. The cases where people get blind or die from moonshine stems from when the feds replaced moonshine with methanol to be able to make that claim and disrupt the business of organized crime during the prohibition. There are still cases now and then where people try to make drinkable alcohol from some industrial base and don’t know how to.

TLDR: Don’t buy, make.

I talk to anaesthetists though work and they say us redheads need more to be kept under. It’s my anecdotal experience with local as well, I always tell dentists and other non specialists that I need more than usual, they never believe me and then they have to give me additional shots later cuz it still hurts. Some try to perform the procedure anyway, which I usually can’t cope with, so I’m not so sure I can handle pain better than others.