LOL you have no idea I have a scar on my leg still from a makita grinder with a cutoff wheel on it. But for glasses a dremel and small wheel should work.Another name for a cut off wheel in lots of automotive shops is the “Wheel of death” - appropriately named for all the maimings and injuries it has caused.
@zwc0442 has hooked me up previously with simple for him work at great pricing, send him a PM and I’m sure you will be happy sending them out to get fixed properly.
(Almost guaranteed you keep all your fingers this way as well)