Cornea - GCSE Biology Definition

The cornea is the clear, dome-shaped outer layer that covers the front of your eye, protecting it from dust, pathogens, and other harmful particles. It works like a window that helps focus the light entering your eye so you can see clearly. The cornea is very important for your vision because it assists in bending, or refracting, light, which helps to form clear images. Unlike other parts of the body, the cornea doesn't have blood vessels, so it gets its nutrients from tears and a fluid in the eye called aqueous humour. Keeping it healthy is key to maintaining good eyesight.