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Definition of op. 1  1 chiefly US : a set of planned actions for a particular purpose âusually plural military ops [=operations] 2  2 : op art. 3  3 British, informal : a medical operation â see also photo op.
Definition. Ophthalmologist-Doctor of Medicine (D.O. or M.D.) - branch of medicine concerned with the diseases and surgery of visual pathways. Optometrist-Doctor of Optometry (O.D.) - eye care profession concerned with vision, eye health and function of visual pathways.