Anatom3DLeft iris
Iris sinistra · Levá duhovka
Sense organs
Looks like
The coloured ring of the eye behind the cornea, with the pupil as the hole in its centre.
What it does
Its muscles widen and narrow the pupil to control how much light enters.
Keeping it well
Inflammation (iritis) causes a painful red eye with light sensitivity — needs an eye doctor promptly. Unequal new pupils need a check.