Are secondhand circle lenses safe to use?

NO its really not safe you can get your eyes infected. circle lenses are really only good for a year and you MUST take care of them and know how to. Your eyes are not something you mess around with. it would be best to buy your own pair of circle lenses theyre not really that expensive. but they are illegal to buy in the us and you can only buy them online. i really dont think circle lenses are a big deal IF you know how to properly take care of them. and you should let your friend know that its not safe to share them so that way she'll know, and not put her own eyes or anyone else's eys in danger either. hope i helped :)