Yep if I play with it too long my eyes go all blurry and I can't see.
I have to wear my glasses now to play angry birds for more than 10 minutes or I can't see for the rest of the day.

I am old too, 54 I guess it is being a sysadmin and sitting in front of computer screens for 12 -14 hours a day the last 20 years that has done my eyes in.