Our eyes are the best-controlled part of our body.
The young man turned to biologists with a feature that was considered impossible.
The eyes react to darkness and light and are affected also by distance focusing but none of this can be controlled by a person.
This young man was an exception.
He said that he noticed a strange feature in his eyes.
So, he could narrow and expand his pupils.
I also could control the diameter, the man told the scientists.
So, it turned out that he could expand it to 2.4 millimeters and also narrow it.
This is rare and the man is an exception.
Now scientists research this as it was a genetic feature.
But this also could be a new step in evolution.
