Experimenting with mice, neuroscientists report new evidence that the eye's iris in many lower mammals directly senses light and causes the pupil to constrict without involving the brain.

Pupil size in response to light could serve as a biomarker for concussion, according to a study published in Life. “A concussive injury to the brain is associated with changes in the PLR [pupillary ...

Researchers are reporting progress in understanding whether a second light-sensing pathway in mammals indeed contributes to the detection of ambient light for controlling body functions. In an article ...