The specific manufacturer or lens type prescribed.
Convenient for immediate pickup, though sometimes more expensive.
Retailers are legally required to verify your prescription with your doctor before completing a sale. How to Get Your Prescription
You can often find better prices, but you must provide your doctor’s info so the site can verify the script.
Under federal law—specifically the —contact lenses are classified as medical devices. This applies even if you are buying "cosmetic" or "color" lenses that don't correct your vision. Why a Prescription is Required
Usually valid for one to two years (varies by state). Buying Online vs. In-Office
Visit an optometrist or ophthalmologist.
Lenses sit directly on your eye; a poor fit can cause corneal ulcers, infections, or permanent vision loss.