How the Bird Eye Was Pushed to an Evolutionary Extreme (opens in new tab)

Yasemin Saplakoglu at Quanta: When an optometrist shines a bright light into your eyes, a vast, branching tree sprouts in your field of vision. This is the shadow of blood vessels. Though we normally can’t perceive them, these vessels always occlude a portion of what we see, and for an important reason. They power the…