aniseikonia vs visual disorder

aniseikonia and visual disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
aniseikonia	Yes	No	No	No
visual disorder	Yes	No	No	No

As nouns, visual disorder is a hypernym of aniseikonia; that is, visual disorder is a word with a broader meaning than aniseikonia:

aniseikonia: visual defect in which the shape and size of an ocular image differ in the two eyes
visual disorder: impairment of the sense of sight

Other hypernyms of aniseikonia include vision defect, visual defect, visual impairment.

aniseikonia (noun)	visual disorder (noun)
visual defect in which the shape and size of an ocular image differ in the two eyes	impairment of the sense of sight