ophthalmic vs ocular

ophthalmic is not a noun while ocular is a noun.

Word	Noun	Adjective	Verb	Adverb
ophthalmic	No	Yes	No	No
ocular	Yes	Yes	No	No

As adjectives, ophthalmic and ocular are synonyms defined as:

Other synonyms of ophthalmic include optic, optical.

ophthalmic (noun)	ocular (noun)
	combination of lenses at the viewing end of optical instruments

ophthalmic (adjective)	ocular (adjective)
of or relating to ophthalmology	of or relating to or resembling the eye
of or relating to or resembling the eye	relating to or using sight
	visible