11. is in darkness … walketh—"is" marks his continuing STATE: he has never come out of "the darkness" (so Greek); "walketh" marks his OUTWARD WALK and acts.
whither—Greek, "where"; including not only the destination to which, but the way whereby.
hath blinded—rather, as Greek aorist, "blinded" of old. Darkness not only surrounds, but blinds him, and that a blindness of long standing.