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

while smaller pupils enhance sharpness, improving tasks like reading. Indeed, this reflex is so reliable that doctors use it to assess brain function. If a pupil fails to react to light ...

The amount of light entering the eye is controlled by a reflex action. The size of the pupil changes in response to bright or dim light. This is controlled by the muscles of the iris.

“We used to think that the pupil was a simple light reflex or that it just indexed arousal,” says Stefan Van der Stigchel, an attention and perception researcher at Utrecht University in the ...

Typically, the pupil contracts and dilates depending on the amount of light entering the eye. Neurologists shine light into the eyes of trauma and stroke patients to gauge their light reflex 1 ...

Iris Coloured part of the eye that contains muscles. These relax or contract to adjust the size of the pupil. Controls how much light enters the pupil. Pupil Hole in the middle of the iris.

while smaller pupils enhance sharpness, improving tasks like reading. Indeed, this reflex is so reliable that doctors use it to assess brain function. If a pupil fails to react to light, it could ...