Yeah I actually pulled my eye right out of my head, and it rolled onto my cheek. It got me great reactions from the spectators though, so it was worth it, and it only took 2 months in hospital to fix. ACTUAL.
LOL.
Seriously though, needing glasses because of thread? Are you high? The need to wear glasses is caused by a number of things, all of them centering around the lens, the cornea, and the iris. If you did something to any of those parts of your eye when performing thread, then you did something very wrong, and its not the fault of the trick.
I think this may be what is commonly known as pattern recognition. You start performing a trick, that involves your eyes, then just like that, as happens with many people, you need glasses. Of course its the -trick's fault.-
Please unless you're using thread laden with bleach, then its not related. This is a safe trick, I've performed it hundreds of times, and my glasses prescription hasn't changed one iota.
Maybe thread actually -prevents- eyes getting worse? Because to be honest, when I started performing it, my prescription stopped getting worse! Prior to that it was getting worse by -0.5 a year. WOW!!!! WH is a healer!!! Or is it just that my prescription stopped getting worse because that's how it is, and it happens?