2.88 understand the function of the eye in focusing near and distant objects, and in responding to changes in light intensity

The Iris Reflex

When you're exposed to bright light it triggers a reflex that makes the pupil smaller. The circular muscle in the iris contracts making the pupil smaller.
In dim light the iris adjusts to let more light in by increasing in size. The radial muscles contract pulling the iris back and making the pupils bigger.

Focusing

Click here for eye diagram.

When the eye focuses by changing the shape of the lens it's called accommodation.

Looking at distant objects:

The ciliary muscle relaxes and allows the suspensory ligaments to pull tight. This makes the lens thin.

Looking at close objects:

The ciliary muscles contract which slackens the suspensory ligaments. The lens becomes more curved.