This lens has a prism to insure that the slit stays up right. Enjoy the detail and have fun with gragon eyes. Color change avalible, Fill out the information below to make sure we use your correct prescription is used for your order. Any changes or request can be added under special instructions. Any question's contact us at 1-800-807-8722 or email us at tintedlens@aol.com. Thank you for visiting www.fxeyes.com, your visit is important to us.