Zombie contact lenses are a popular way to complete a zombie Halloween costume. They transform the wearer's eyes into an accurate zombie appearance, coming in a variety of designs from slow-moving to raging zombies. Special effect lenses add drama and realism, with popular colors being bloodshot red, white, and black. While decorative lenses can be worn without a prescription, it is best to get lenses prescribed by an eye doctor for safety, as unauthorized lenses risk eye injuries and vision problems.