What i'm trying to say is... from my experience...
If i wear my glasses all the time, my eyes get used to it and my eyesight gets worse over time (new stronger glasses after new perception test a few years later).
If i don't wear them often, i feel like my eyesight is improving again. I got to a point where i could use old glasses again with a softer perception and they were perfect again.
When i first needed glasses, i couldn't read all the letters on the chalk board in school from way back in the room. Then i was wearing glasses all the time for years. These days, i can't read anything, even if it's written in fairly big letters, unless i'm not further away than about three meters. I say my eyes got used to glasses and have become "lazy".
Maybe i'm wrong about this, but it sure feels like my eyes adjusted over time (for the worse).
My mother stopped wearing glasses years ago (short sighted), and her eyesight has improved again over the years (which would somehow proove Crashgates point actually, and not mine... lol).
And back on topic: Go for it Tor! Just don't forget to take them out when you're drunk for days...