Fancy, with tinted lenses, you can even change the colour of your eyes.

ECONOMIST: Otto Wichterle

In the pre-Best days no one cared about the colour of a player's eyes.

ECONOMIST: George Best

But his colour suddenly drained, the whites of his eyes turned yellow and his abdomen became swollen and tender.

BBC: Ronald Tatchell

Engineers could control which bits of the eyes were illuminated in a specific colour, to make the toy appear as if it was rolling its eyeballs, blinking, or showing two small throbbing hearts.

BBC: Disney develops 3D-printed lighting for toys