眼鏡を目に合わせなくてはいけない。

spectacles; glasses; judgement; discrimination; discernment; insight

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

eye; eyeball; eyesight; sight; vision; look; stare; glance; an experience; viewpoint; stitch; texture; weave; ordinal number suffix; somewhat; -ish

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to match (rhythm, speed, etc.); to join together; to unite; to combine; to add up; to face; to be opposite (someone); to compare; to check with; to cause to meet (e.g. an unpleasant fate); to place together; to connect; to overlap; to mix; to combine; to put blade to blade; to fight

if ... then; when; and; why don't you...?; the more (one does something); because; since