A 23-year-old student in Germany can reportedly shrink and enlarge his pupils on command, a feat previously thought to be physically impossible.
The dilation and constriction of the pupil were believed to be completely automated processes triggered by various factors, like entering a bright or dark environment, but a recent case study suggests that isn’t always the case. A young student in Germany is believed to be able to voluntarily control the tiny muscles that adjust the size of the pupil, a feat once thought to be impossible. The authors point out that while some people can alter their pupil size via “indirect methods”, this person is instead able to directly control the sphincter muscle in his eyes to adjust the size of his pupils.
