My bottle of Loctite super glue gives advice only if the stuff gets on skin. But it might be worth a try: use soap, hot water, and a blunt edge, e.g. teaspoon handle. Can't do any harm.
are the glasses now ruined or can you still use them? You might contact the place you got the glasses from to get advice. If they are ruined anyway I would try the Loctite glue remover on the basis that things can't get worse
Nail varnish remover is most likely a solvent for the lens plastic so only use it as a last resort. y
You can test the NVR by putting a very small spot on a part of the lens that you don't usually look through, leave it to dry and then see if you can wipe every trace of it of with a soft cloth. If it leaves a mark of any kind don't use it.
Model shops sell a product made by Pacer Industries called Zap Z-7 Debonder.
It's American but is available in the UK and even on EBay.
See item no. 121373444704. The rear label says it 'will not craze most plastics', but I would test it first. I have used it and it does soften the superglue enough to get rid of it more easily using a cotton bud. I've followed up on plastic with judicious application of metal polish. T-Cut would be too harsh. Good luck.
"Straight" acetone, no (as a general rule): however, nail-polish remover is a very diluted from of acetone. As always, there are no hard and fast rules: sometimes, experimentation is of the essence.
I'm pretty sure water (eventually) softens cyanoacryllate ("super") glue.
Try leaving the affected part of your specs soaking in a glass of water for a few days.
As an aside, recently I had to buy a new bezel (the brass ring that goes around the dial) for an antique clock I was restoring as it was missing it. The new one came looking all gaudy and "blingy". So I soaked a cloth in nail-polish remover and gave it a good wiping. All of the shellac/varnish type shiny coating came off and left a nice dull finish.