Optometrists are primary eye care providers and they focus on maintaining and enhancing the visual health of their patients. While their primary focus lies in diagnosing and treating visual impairments and eye diseases, some optometrists may also incorporate natural health products into their practice to support eye health. These products can include nutritional supplements containing vitamins, minerals, and antioxidants that are believed to promote eye health, such as lutein, zeaxanthin, omega-3 fatty acids, and vitamin C.