It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and ...

"Previous research over the past three decades has repeatedly demonstrated how pupillary reflexes and responses can be correlated to depressive episodes," she explains. The system accurately ...

Iris Coloured part of the eye that contains muscles. These relax or contract to adjust the size of the pupil. Controls how much light enters the pupil. Pupil Hole in the middle of the iris.