I think the thing was, I've been wearing glasses for decades, so my eyes and my brain were used to just letting focus slide when I swiveled my eyes out of the main field of view. Now, I maintain my focus over a much larger area, some of which I had to retrain my onboard equipment for. After the first week, though, it's all good. Try focusing your eyes really sharply on something and moving it over to the extreme edge of your sight, so that your eyes are all the way to one side or the other, and you'll see what I mean. Anyway, now it's just a question of longevity, lol...they've already stood up to the hyper-chlorinated water at the local water park, they've stood up to the wind-blown dust when I mowed our patch o'dirt. Next stop...DISNEYWORLD! If the Mouse can't break 'em and they don't get stolen, they should be good for the long haul, I guess...