Organs that get oxygen from the air

The front part of the eye, the one that covers the iris and pupil, called cornea, doesn’t get oxygen from the blood.

Since transparency is of primary importance to the eye, the cornea has no blood vessels.

In fact, it receives the necessary nutrients by diffusion, from the tear fluid on the outside, and from the aqueous humour on the inside.

The cornea is also the only part of the human body that ‘breathes’ on its own: it receives oxygen by diffusion, directly from the air.