vision defect vs visual disorder

vision defect and visual disorder both are nouns.

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

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

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

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