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... Why do people go to the opticians? Hallux's i-Guide: Getting New Glasses! Hallux's i-Guide: How do we see?