With demands of work productivity shooting up stress levels, researchers have discovered that a person’s eyes may offer a solution.

The study showed that the pupil dilation - widening of the pupils of the eyes - could be used to indicate levels of stress of a person. 

Many people are multi-tasking but there is no measurement for someone’s mental well-being. However, we found that the size of a pupil could be the key to measuring
someone’s mental state while they multitask,” said an Assistant Professor from the University of Missouri in the US.

To understand, the researchers used a simulated oil and gas refinery plant control room where they watched, through the motion-capture and eye-tracking technology, as
the participants reacted to unexpected changes, such as alarms.

During the scenario’s simple tasks, the participants’ eye searching behaviours were more predictable. Yet, as the tasks became more complex and unexpected changes
occurred, their eye behaviour became more erratic, the findings revealed.

The team hopes that this can give a better insight into how systems should be designed to avoid mentally overloading workers and build a safer working environment.