A little background... I'm 55 and have worn glasses for like 45 of those years. I can barely see the computer screen (let alone read anything on it) without them. Also have glaucoma that requires several drops of medicine daily to control and unfortunatly has taken Lasik off the board.
Several years back I had to switch to progressive lenses and I was worried that this might affect my game. I can't say that there was no adjustment period, but overall haven't really had any problems with these. My wife on the otherhand struggles quite a bit with her progressive lenses. I also have Transitions lenses and this helps quite a bit as well.
Also have been using yellow balls exclusively the past 4-5 years because I can pick these up quite a bit better than white.