Students seeking to make a real difference will find no better career than optometry. Only one degree qualifies you to become an optometrist: the Doctor of Optometry (O.D.), a four-year, doctoral-level degree. While concentrating primarily on structure, function, and disorders of the eye, students in a professional O.D. program will also take courses in human anatomy, biochemistry, and physiology, among others, to prepare for their role as primary-care doctors protecting patients’ overall health and wellness.