Who has more training an OD or MD?

An MD (Doctor of Medicine) typically undergoes more training in terms of years of formal education and residency. MDs complete four years of medical school followed by a residency program that can last anywhere from three to seven years or more, depending on their specialty. ODs (Doctors of Optometry) complete four years of optometry school after undergraduate education, but they do not complete a residency unless they choose to pursue additional training. Therefore, MDs generally have more extensive training overall.