An optician is a professional who specializes in the fitting and dispensing of eyeglasses and contact lenses. They are also responsible for providing advice on the selection of frames and lenses that best suit the patient's needs. Optometrists, on the other hand, are medical professionals who diagnose and treat vision problems and eye diseases. They also provide vision therapy and prescribe corrective lenses. Opticians and optometrists work together to ensure that patients receive the best possible care for their vision needs.