A few years ago, I forgot my sunglasses and was blinded by the sun, so I urgently bought these at Megane no Sanjo and only used them for one day. They don't suit me, so I've been displaying them in a collection box. I've lost the case. I don't think there are any noticeable stains, but this is just my subjective opinion, so please understand that these are used items. They are round and cute. They can be used by anyone. As for the lenses, I have them checked regularly for deterioration at an optician's, so I think there are no problems.