Yea, turn thy vision [upon it] again and yet again: [and every time] thy vision will fall back upon thee, dazzled and truly defeated

Again turn thy vision a second time: (thy) vision will come back to thee dull and discomfited, in a state worn out.

Then look again and yet again, thy sight will return unto thee weakened and made dim.

Then turn the eye again and again -- thy look will return to thee confused, while it is fatigued.

Then return [your] vision twice again. [Your] vision will return to you humbled while it is fatigued.