visually impaired vs purblind

visually impaired and purblind both are adjectives.

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

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

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

visually impaired (adjective)	purblind (adjective)
having greatly reduced vision	having greatly reduced vision
	lacking in insight or discernment