Synthetic iris could let cameras react to light like our eyes do

An artificial iris can open and close in response to sunlight without any other outside control, just like the ones in your eyes. This could help improve cameras and, eventually, repair damaged human eyes or control tiny robots that react to their surroundings. In the eyes of humans and many other animals, the pupil is a hole that lets light inside the eyeball. The iris is the coloured part of your eye, a thin circle that controls the size of the pupil, modulating how much light gets through. In bright light, the iris contracts to shrink the pupil, protecting the sensitive retina inside your eye, which sends visual signals to the brain.