A discussion of linguistic accessibility and euphemism. 目の不自由な人 ('person with inconvenient eyes' = visually impaired) is the standard euphemism replacing the older, more direct 盲人. ~とする here means 'to set as X, to define as X', used when proposing a substitution. 言い換え is the verb stem 言い換える ('reword, rephrase') nominalized.