I’ve seen the blackwork that works on both sides and it is indeed mind-bending! Maybe one day I’ll give it a go, but that day is far distant :D

I also have terribad eyesight. I actually use my old glasses for embroidery, since my shortsightedness is now so bad that my current glasses make close-up work harder. (This is definitely caused by the strength of the glasses, since I’m fine at close work without any glasses on and my optician says I’m not longsighted yet at all — so bifocals/varifocals are not a solution. But I don’t want to embroider with my glasses off entirely since I like to read/watch stuff on my laptop at the same time and I can’t see that far without glasses.)