An OPTICIAN is a specialized practitioner who designs, fits and dispenses lenses for the correction of a person's vision.
An OPTOMOTRIST is a Doctor of Optometry or O.D. who provides primary vision care. They must complete a four year postgraduate Doctor of Optometry program and be state licensed. They diagnose and treat eye diseases and disorders. They also determine if vision correction is needed. If it is they prescribe eyeglasses or contact lenses. Most can prescribe medications for eye health. Some states license them for laser correction surgery.
An OPHTHALMOLOGIST is a M.D. or D.O. They study general medicine first and then go on to specialize in the diagnosis and treatment of problems specific to the eye. They are licensed to perform eye surgery in addition to providing primary vision care.
Neuro-ophthalmologists combine the subspecialties of neurology and ophthalmology to treat vision problems having to do with the nervous system.
My personal experience has been that moving 'up' this specialist ladder meant they listened to me and the explanations I could offer abut my vision experience less and less. What you need isn’t always the same things as the best specialist there is.
OCT is optical coherence tomography. It doesn’t serve as a definitive diagnostic tool for MS but might help convince some neuros. Dr. Quix gave it a good talking up at
http://www.medhelp.org/posts/Multiple-Sclerosis/OCT-eye-exam/show/1226009 It’s a discussion from 2010 but I’m going to bump it up so others might see it as well.