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.

The 48-year-old man had pain, double vision and blurriness in the eye for a week before seeking help at an ophthalmology clinic.

Doctors noted bruising of the left eyelid and a distorted pupil, with a corrected visual acuity of 20/40 in the right eye and 20/200 in the left.