Originally posted by LikeASong:[..]
I've wore all kinds of glasses for 20 years and very humbly, let me tell you that this is just not right. Metal glasses mounts weigh about 20-25 grams and acetate frames weigh about 30-35 gr. so it's not really noticeable. Also, as long as we know Bono doesn't have any visual defects (apart from his glaucoma) so the proper lenses must not weight much (mine weighed a ton because I used to be a myopic - the more dioptres, the thicker your glass is). So I'm pretty sure Bono's glasses are rather lightweight.
Normally acetate frames don't weigh so much, but I think this depends on the kind of frame. The frame of the glasses he's wearing now looks quite heavy, as the frame is very thick. I can't find the weigth of his round glasses (Oliver Peoples, called "The row after midnight") online, but if I compare them with similar frames from other manufacturers like RayBan, the weight is below 20 grams.
Anyway, that's not important at all
