emmetropic vs emmetropia

emmetropic is not a noun while emmetropia is a noun.

Word	Noun	Adjective	Verb	Adverb
emmetropic	No	Yes	No	No
emmetropia	Yes	No	No	No

emmetropic (noun)	emmetropia (noun)
	(ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina

emmetropic (adjective)	emmetropia (adjective)
of or relating to the normal condition of the eye in which visual images are in clear focus on the retina