visually challenged vs sand-blind

visually challenged and sand-blind both are adjectives.

Word	Noun	Adjective	Verb	Adverb
visually challenged	No	Yes	No	No
sand-blind	No	Yes	No	No

As adjectives, visually challenged and sand-blind are synonyms defined as:

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

visually challenged (adjective)	sand-blind (adjective)
having greatly reduced vision	having greatly reduced vision