There are two types of colored contact lenses. Most colored contacts are lenses made to improve your vision, just like glasses would. There are also decorative contacts. These do not help you see better. Instead, their purpose is to change the look of your eye, maybe to go along with a Halloween costume. The most important thing to know about colored contact lenses is that you should get them only with a prescription from an eye doctor. It's not wise to think of contacts as a cosmetic. Wearing contacts is not the same as wearing makeup or changing your hair color. Contacts are medical devices an eye doctor must fit to your eye. One size does not fit all. You should never wear contacts your eye doctor has not prescribed to you. Wearing contacts—regular colored ones or decorative ones—without a prescription could cause an ulcer on your eye or an infection. You could even lose your vision. The Basics of Colored Contacts Like all contact lenses, a colored contact is a thin disc that floats on the surface of your eye. They can improve your vision as well as clear contacts. You can wear colored contacts if you are nearsighted or farsighted, or have blurry vision. Colored contacts can change or enhance the color of your eyes. Having your contacts tinted to a color also makes them easier to see when they're in their case or on your fingers. (And they're easier to find if you drop one.) There are several types of contact lenses. All come in colored and clear versions. Hard lenses hold their shape. Soft lenses may be more comfortable. Some lenses must come out at night. Other types can stay in for a week. Some are used once and thrown away. Your eye doctor will help you decide what type of lens is best for your vision correction and lifestyle. The color choice is yours. Important Warnings About Colored Contact Lenses It's possible to get decorative contacts without a prescription. This is a bad idea. Decorative lenses don't help your eyesight, and they can do a great deal of harm. If you want decorative lenses for a special occasion, talk with your eye doctor. Contact lenses are medical devices that require a prescription. To avoid dangers and keep your eyes safe and healthy: Never use costume or cosmetic contact lenses without going through your eye doctor. Do not buy contact lenses that are not approved by the U.S. Food and Drug Administration. Do not buy Halloween or costume contact lenses at costume shops, at beauty salons, or from the internet. Never use contact lenses called circle lenses or anime lenses. These are oversized contacts that are supposed to make your eyes look very big. They first became popular in Asian countries. However, they are not legal in the United States. Eye health experts consider them dangerous. Remember: Any contact lens you can get without a prescription is illegal and dangerous. The Bottom Line on Colored Contacts Colored contacts can be as safe as clear ones. The color of the contacts is not the issue. To make sure your eyes stay healthy: Only wear contacts with your eye doctor's prescription. This applies to regular colored contacts and decorative ones. Don't share or use anyone else's contacts. Clean and care for colored contacts the same as you would for clear ones. Carefully follow the instructions that come with your contacts. If you have any questions, ask your eye doctor.