They also betray mental and emotional commotion within. In fact, pupil dilation correlates with arousal so consistently that researchers use pupil size, or pupillometry, to investigate a wide range of ...

Dilated pupils (mydriasis or fixed pupils) are when your eyes' pupils, which let light into your eyes, become wider. This can happen due to medications used during an eye exam (mydriatic drops ...

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

You have probably heard the saying that the eyes are the windows to the soul, but now it turns out that they are also ...

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.

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

A person’s pupils may be of different sizes (anisocoria) for several reasons, including physical trauma, response to light, and infection. The condition may also be present from birth.

Hold a pen at arm's length, focus on it for five seconds, then look at an object approximately 10 feet away for another five ...