anorthopia vs vision defect

anorthopia and vision defect both are nouns.

Word	Noun	Adjective	Verb	Adverb
anorthopia	Yes	No	No	No
vision defect	Yes	No	No	No

As nouns, vision defect is a hypernym of anorthopia; that is, vision defect is a word with a broader meaning than anorthopia:

Other hypernyms of anorthopia include visual defect, visual disorder, visual impairment.

anorthopia (noun)	vision defect (noun)
distorted vision in which straight lines appear curved	impairment of the sense of sight