It is quite fun to see people get freaked by freaky contact lenses you wear. Some common freaky contact lenses are Vampire Black Out , Manson, Green Ghoul, Target, Berzerker and Blind special effects contacts. You should choose different types of contacts based on your costume. When you are wearing them, follow your eye care professionals instructions for the proper use and care of your contact lenses.
If you really want to buy some freaky contact lenses for fun in Halloween, I have some pieces of advice for you. In the first place, you can surf the Internet to find out some websites that sell popular and freaky contact lenses. Then, pay attention to the choices of the contacts' color. I think you can consider to choose some scary colors like white, red and black. What's more, some freaky makeup will also be helpful.