visual disorder vs vision defect

visual disorder and vision defect both are nouns.

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

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

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

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