acuity vs visual acuity

acuity and visual acuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
acuity	Yes	No	No	No
visual acuity	Yes	No	No	No

As nouns, acuity and visual acuity are synonyms defined as:

acuity and visual acuity: sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)

Other synonyms of acuity include sharp-sightedness.

acuity (noun)	visual acuity (noun)
a quick and penetrating intelligence	sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)