Contact Lens Prescription: Contact lenses are FDA Class II medical devices that can only be dispensed by a prescription. This applies to contact lenses that help you see better or simply worn to change the color of your eyes. They must be regarded with the same caution you would use for prescription drugs, which include prescription expiration dates and follow-up visits with your eye doctor.
A contact lens prescription is different and separate from a glasses prescription. Since contact lenses touch the eye, the numbers may be different due to optical mathematics. Your eyes go through gradual changes in size, shape and physiological requirements (such as for oxygen) while wearing contact lenses. These changes can affect the health of the cornea and need to be monitored on a regular basis. For these reasons, contact lens prescriptions expire after one year (or sooner if the doctor determines a medical reason for a shorter expiration date).
Comprehensive Eye Examination | Contact Lens Procedure | Contact Lens Prescription