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ST. LOUIS (KSDK) - Right in time for Halloween, there's a warning about those decorative contact lenses.

They're illegal in Illinois, and by federal law, a prescription is required to buy them. But you'll still find them on some store shelves and on-line, and they can cost as little as $20. If you're not careful, they can cause serious eye damage.

Mary Migneco, an optometrist Barnes-Jewish Hospital, joined First @ 4 Wednesday to talk about how some states have gone out of their way to ban the lenses.

Click the video player above to hear the kinds of damage they can cause to your eyes.