If you buy Halloween contacts lens in the wrong color or with the wrong prescription you could end up with permanent damage to one of your corneas, your eyelids, or both. The most common mistake people make when buying Halloween contact lens online is to order lenses with a very low vision correction index (VCI). This is the equivalent of putting a blindfold on your eye when trying to buy something off of a store shelf.
One of the main reasons that a lot of costume designers are selling Halloween contact lenses online is because you don't have to actually visit any Halloween costume shop in order to get your hands on a cool pair of colorful contacts. All you have to do is go to your favorite search engine and type in "haunted house", "Z Zombie TV Shows" and "cornea damage" in the search box. You'll get a long list of websites that sell Halloween supplies including contacts.