It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and cognitive effects.

“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 ...

Pupillary light reflex can be inhibited by multisensory signals Aug 11, 2021 Pupil size during very light exercise predicts benefits to prefrontal function, study shows ...

When a bright light hits your eyes, your pupils constrict causing a sneeze. They say this reflex usually happens on initial exposure to the sun or a very bright light. If this is something that ...

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.

Refracts light as it enters the eye (by a fixed amount). Iris Coloured part of the eye that contains muscles. These relax or contract to adjust the size of the pupil. Controls how much light ...

Like the aperture in a camera, the pupil controls how much light reaches the eye. It is therefore fundamental to our vision and how we perceive our surroundings. Three mechanisms that can change ...