Stupid question time!
I should note that I have never worn glasses before and have recently been and got a pair on prescription as my right eye is fairly bad at distance stuff.
I found all this out while working at work on my laptop and found that I squinted a lot and really strained my eyes.
After visiting the Opticians (for some reason I almost wrote dentist then..

) it turns out im long sighted... or short sighted... I dont know, I cant see things far away.
Now, when I went to the opticians, I specifically said that I needed them for computer work and consequently got an anti-glare coating on the lenses.
So... here I am, on my laptop and I'm wearing them, knowing they are long distance lenses, am I potentially damaging my eyes by using them for close up stuff? I mean, everything is so clear, its great!