Do you get confused or wonder what the difference is between an OD, MD, and DO ? An excellent website describing the Doctor of Optometry (OD) profession and education can be found at the American Optometric Association's site. Also, the University of Houston College of Optometry's web site describes in detail the rigorous training/education involved in the optometric program. ( By the way, an MD is a Doctor of Medicine and a DO is a Doctor of Osteopathy).