This is honestly something I should have been preaching on for a long while now, and even when I post videos of make up tutorials that involve contacts I should have placed a disclaimer on them that contacts should only be purchased via licensed eye doctors and never from costume or party stores.
This story from Michigan is another reason why you should never assume costume contacts are safe. A teenage girl was left with a severe eye injury that may now require surgery to repair (if her vision can ever be fully restored) after removing a costume contact lens that caused an injury to her cornea.
Meanwhile, the FDA has warned that no one should be selling contact lenses unless they are licensed to sell medical devices. In fact, it is illegal for any store to be selling costume contact lenses without proper licensing which would allow for medical oversight.