hemianopia vs hemianopsia

hemianopia and hemianopsia both are nouns.

Word	Noun	Adjective	Verb	Adverb
hemianopia	Yes	No	No	No
hemianopsia	Yes	No	No	No

As nouns, hemianopia and hemianopsia are synonyms defined as:

hemianopia and hemianopsia: blindness in one half of the visual field of one or both eyes

hemianopia (noun)	hemianopsia (noun)
blindness in one half of the visual field of one or both eyes	blindness in one half of the visual field of one or both eyes