vision defect vs visual defect

vision defect and visual defect both are nouns.

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

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

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

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