Medical terms explained
Collagen
A type of protein that makes up a lot of the connective tissue in the body.
Cornea
The clear covering of the eye – needed for focusing.
Epithelium
The layer of cells covering the outside of the eye.
UV
Ultraviolet light. There are 3 types: UV‑A, UV‑B and UV‑C. UV‑A is responsible for skin tanning and the production of vitamin D in the body.