Doctors of optometry (O.D.s/optometrists) provide more than two-thirds of primary eye health care in the U.S. Optometrists are one of three types of eye care providers, alongside ophthalmologists (specialists who focus on more advanced surgical procedures) and opticians (who fit and/or fulfill corrective eye wear at the direction of either an optometrist or ophthalmologists). As health care providers, optometrists are trained to examine, diagnose, treat and manage eye disorders, diseases and injuries that manifest in the eye. In addition to providing eye and vision care, they may also play a key role in an individual’s general health and well-being. Optometrists can detect systemic diseases, provide vaccinations and prescribe medications.