Knock-offs of any product are never as good as the original. And there are some products that you should just NEVER by the knock-off version, like contact lenses from a flea market.
Back in February of last year, Liza Garcia went to the National Flea Market of Lubbock, Texas to buy some cosmetic contacts that make her eyes look a different color. After three days, Garcia went to the hospital because her eyes became irritated and swollen. After a couple of different hospital visits, it was determined that she had a bacterial infection in her eye and she is now blind! Garcia is now suing for damages.
The FDA clearly says that any place that sells cosmetic contacts without seeing a prescription is illegal. Yeah, it sucks that she is now blind over the contacts, but in all fairness, maybe she shouldn't have gotten knock-off contacts from a flea market and had the confidence to use them!