Why has this man’s iris collapsed?

He copped a bungee cord in the face
Collapsed iris

A man in Taiwan experienced an eye-watering injury when he was whipped in the head by a retracting bungee cord being used to secure items on a motorbike.

The real slap in the face? The sharp blow caused the iris in his left eye to detach, collapsing in on itself and completely obscuring his pupil.