Is it safe to buy no prescription contact lenses from a flea market?

[Herkimer]

I use prescription contact lenses, and everyone at school is staring to wear colored contact lenses that they buy at flea markets. My friends got me a bunch of colored contact lenses as moving away gifts, so is it safe to wear these with my glasses over them, or is it safe to wear them at all? They came well packaged an everything.

[Herman]

It is not safe to do that because not everyone has the same shape and size of the eyes. If you put in the wrong sized contacts, it may cause abrasions and make your eyes feel pain. Some can even damage your vision.You need to see your eye doctor and have your eyes measured before you get a pair of contacts. I think you shouldn't use those contacts.