visual disorder vs visual impairment

visual disorder and visual impairment both are nouns.

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

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

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

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