The sight of the hare is not keen for several reasons. The eyes are prominent; the lids are too small and do not give protection to the pupils; consequently the vision is weak and blurred. Added to this, though the animal spends much time asleep, it gets no benefit from that, so far as seeing goes. Its speed, too, accounts in no small degree for its dim sight. For it glances at an object and is past it in a flash, before realising its nature.