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 ...

Medically reviewed by Christine L. Larsen, MD The pupil is the opening located in the center of the iris of the eye. It ...

“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 ...

whereas constriction of the opposite pupil is a consensual response. If the dog does not seem to respond to light, the dazzle reflex should be evaluated by shining a bright light into the eye.

Flash photos typically produce a red reflection in people’s eyes, but sometimes that reflection can appear white or gray, ...

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 ...

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.