It's illegal to sell any contact lenses without a prescription in the United States. All contact lenses are medical devices that require a prescription and proper fitting by an eye-care professional. Retailers that sell contacts without a prescription are breaking the law and could be fined for each violation.
Never buy colored contact lenses from a retailer who doesn’t ask for a prescription.
Even if you have perfect vision, you need to get an eye exam and a prescription from an eye care professional before you wear any kind of contact lens. A prescription ensures that the lens is a proper fit for your eye, among other things. If the lens doesn't fit properly, it could prove difficult to remove and cause serious injury.
Get an eye exam from your Optometrist or Ophthalmologist who will measure each eye and talk to you about proper contact lens care.
Obtain a valid prescription that includes the brand name, lens measurements and expiration date.
Purchase the colored contact lenses from a retailer who asks for a prescription.
Follow the contact lens directions for cleaning, disinfecting and wearing the lenses.
Never share contact lenses with another person.
If you notice redness, swelling, excessive discharge, pain or discomfort from wearing contact lenses, remove the lenses and seek immediate medical attention from an ophthalmologist. Eye infections can become serious very quickly and sometimes the damage is not reversible.