Zombie or devil contact lenses may elevate a Halloween costume’s fright factor, but wearing them without a prescription could result in something far more terrifying – blindness. Eye Associates joins the American Academy of Ophthalmology in urging Halloween shoppers to understand the risks of wearing over-the-counter contact lenses. While it is illegal to sell non-prescription contact lenses, they can still be easily purchased at many places such as beauty supply stores, costume shops and on the web. Falsely advertised as “one-size-fits-all” or “no prescription necessary,” these lenses can cause serious eye damage. Last year, one girl became partially blind in her left eye, the top layer of her cornea having been ripped off, after a mere four hours of wearing non-prescription contact lenses she bought at a jewelry booth.