You must visit an eye doctor (optometrist or ophthalmologist) for a comprehensive eye exam and a specialized "fitting".
The doctor measures your eye's curvature, diameter, and tear film to determine the best lens type and brand for you. how to buy contact lenses
By law, your doctor must provide a copy of your contact lens prescription immediately after the fitting is complete, even if you don't ask for it. You must visit an eye doctor (optometrist or