In terms of major, they are two different disciplines. One is Ophthalmology, and the other is Optometry, each professional has their school, education, college, and undergraduate, graduate and doctor. The contents of a small part of the knowledge that they learn is same, like ocular anatomy and visual physiology, but most of the knowledge is not the same.
Ophthalmology: study the organic disease, the method of treatment is medication, injections, and surgery.
Optometry: study of visual function (eye pain, headaches, ghosting, visual fatigue, heterophoria significant strabismus, amblyopia, three stereopsis, hyperopia, presbyopia, cataract surgery etc.). Processing method is to add the correct Ball mirror supplemented, prism decomposition, visual training, and scientific guidance with eye