Ok Zack Ill give you a short history on ODs. Optometry started around the late 1700, early 1800s as spectacle peddlers and jewelers selling eye glasses. Around the mid to late 1800s schools of optometry were opened to standardize Optometry. I believe the earliest record of the Doctor of optometry degrees awarded is from Northern Illinois College of Optometry, founded in 1871, (NICO merged with Monroe College of Optometry to form ICO), and the New England College of Opt. 1894. They awarded the degree of Opt. D., which was shortened to OD. In the 1800s the pre entry requirement was that you finished high school. By 1910 Optometry schools began requiring undergraduate school before entering. Between 1930-1945, although Optometry was supposed to be standardized there were 3 and 4-year programs. The 3-year program leading to a Masters of optometry or M.opt. 4-year leading to the O.D. degree. Most of the M.opt degrees were awarded from the university-affiliated schools because making Optometry a doctorate level degree was strongly opposed by university graduate schools and medicine. The 4-year OD degree became the US standard around the 1960s, and towards the late 70s schools like SCCO and UCBSO began requiring a published research project with thesis for graduation.
A couple bits of trivia. According to some, when Columbia University had a school of Optometry, a movement in the 1940s by the students was the catalyst that got all University affiliated Optometry schools to go to a 4 year, graduate OD degree.
In 1904, the Los Angeles Medical School of Ophthalmology and Optometry was chartered. Degree awarded was either a Doctor of Optometry, for a 6-month term $75.00 or a Doctor of Ophthalmology for an 8-month term $100.00. The Los Angeles Medical school of Ophthalmology and Optometry later became SCCO.
Optometry like Medicine, Dentistry, etc. fills a need. The number of state supported Optometry schools, which were all founded by a legislative act, reflects this need.
Although turf wars go on between ODs and OMDs symbiotic relationships exists especially in academics. There are many Ophthalmology residency programs that have faculty ODs appointed as professor of Ophthalmology and responsible for teaching contact lens, binocular vision, primary eye care, and I believe 2 recently appointed ODs teach treatment and management of ocular pathology,. Like wise there are OMDs that teach at OD schools appointed as Professor of Optometry.