I see a lot of complaints about the low quality of these, but I have not experienced that at all. I think these are surprisingly sturdy for costume glasses that have no practical purpose. Regarding the sizing, they probably are rather small; they fit me snugly (though not in an uncomfortable way) and look perfectly normal on my face, however my husband wouldn't be able to get them onto his biggo head. I guess my noggin is pretty small, because most sunglasses slide off of me and are just a bit too big. I don't have any complaints about these; they arrived in perfectly good condition, were clean and without scratch or flaw, and are well made for what they are. However, I sincerely doubt these could be used for any other purpose, like changing out the lenses for prescription, which IMO is unfortunate because they actually look good on me for once!