Writing stories about arcane topics is good because, if nothing else, you learn some weird shit. Here are useful distinctions*:
Optometrist: A specialist in optometry (examining the eye for defects and faults of refraction and the prescription of correctional lenses and exercises but not including the use of drugs or surgery).
Ophthalmologist: A physician that specializes in the study and treatment of defects and diseases of the eye.
Oculist: An alternate term for either of the above two.
Optician: A maker of or dealer in optical items and instruments; one that grinds spectacle lenses to prescription and dispenses spectacles.
Opticist: A specialist in optics (the science of light).
Ocularist: One who manufactures prosthetic eyes. We've got our own right over in Coralville, in the form of Iowa Eye Prosthetics, Inc. ("We specialize in special eyes.")
*All definitions from Webster's Third except "ocularist," which surprisingly is too obscure for them to include.
Also, I discovered the publication of Meat Goat Monthly News. You know, niche market. The photo on the cover is perfectly horrific, given the woman's position on the food chain vis-à-vis the goat.