Scientists have long studied the size of our pupils to understand attention, emotion and even medical conditions. But now, ...

Breathing influences pupil size, with contraction during inhalation and dilation during exhalation. This effect, controlled ...

The effect of pupil dilation with tropicamide on vision and driving simulator performance. Eye 2000;14:302–6.

Dilation and constriction of the pupils reflect not only changes in light intensity but also ongoing mental activity. The response is a measure of interest, emotion, thought processes and attitudes ...

Study reveals a link between breathing patterns and pupil dilation, shedding light on how respiration affects brain function.

The company announced it has successfully started imaging patients with its first prototype of its device using both ...

The science of pupillometry takes a common intuition — that you can tell a lot about someone when you look them in the eye — and makes it concrete, measurable, and extraordinarily useful.

The black circle in the center of your eye is your pupil. It changes size thousands of times a day. When you're in dim light, it gets bigger to let more light in. When you're in bright light ...