visual defect vs visual disorder

visual defect and visual disorder both are nouns.

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

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

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

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