visually impaired vs visually challenged

visually impaired and visually challenged both are adjectives.

Word	Noun	Adjective	Verb	Adverb
visually impaired	No	Yes	No	No
visually challenged	No	Yes	No	No

As adjectives, visually impaired and visually challenged are synonyms defined as:

visually impaired and visually challenged: having greatly reduced vision

Other synonyms of visually impaired include dim-sighted, near-blind, purblind, sand-blind.

visually impaired (adjective)	visually challenged (adjective)
having greatly reduced vision	having greatly reduced vision