We’ve all seen them- those incredibly creepy yet very cool looking contact lenses that make a person’s eyes look extra spooky. Thinking of putting in a pair this Halloween? You might want to reconsider.

I've never been brave enough to wear these contacts, but have friends who have. And you can bet that I've passed this news on to them- federal health officials have issued a warning about wearing those cool looking contacts because most of the ones you find in the store are not only unapproved, but illegal.

Not only are the contacts illegal, but the reason the FDA is freaking out and warning people not to wear them is because they can damage your eyes, even causing blindness in some cases.

According to the FDA, people should not use contacts purchased at Halloween stores, beauty stores, on the internet or anywhere else where a prescription is not required.