Eyes vary in shape. An eye doctor must measure the base curve and diameter to ensure the lens doesn't scratch the cornea or cut off oxygen.
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
This is a separate step from a standard glasses exam to measure the eye surface.
Understand the specific numbers on your current prescription box.
Convenient for immediate pickup, though sometimes more expensive.
Visit an optometrist or ophthalmologist.
