visual impairment vs visual disorder

visual impairment and visual disorder both are nouns.

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

As nouns, visual impairment and visual disorder are synonyms defined as:

Other synonyms of visual impairment include vision defect, visual defect.

visual impairment (noun)	visual disorder (noun)
impairment of the sense of sight	impairment of the sense of sight