Sensory adaptation, the same phenomenon that causes you to stop hearing a continually ticking clock, also prevents you from seeing the branching network of blood vessels inside your eye. Except when you use the simple trick demonstrated in this video. More »

Read more: http://feeds.gawker.com/~r/gizmodo/full/~3/_MQYcL6OaU4/freakythis-simple-trick-lets-you-see-the-blood-vessels-in-your-eye