Hallux’s i-Guide: Cornea The cornea is right at the front of your eye! It’s transparent and forms the outer layers, which protects the iris and the pupil. It also helps to focus light on the retina! Next: Pupil > Visit Professor Hallux’s i-Guide homepage > Download the free i-Guide podcast from iTunes More to click... Check out these self-healing materials! Everything you need to know about SpaceX How will spaceports make money?