A groundbreaking study has revealed that our pupils change size in sync with our breathing—a response now dubbed the "pupillary respiratory phase response." ...

In most cases, pupils change size based on the light and dilate ... "But it can happen from underaction of the constricting muscle or overaction of the dilating muscle of the affected pupil." ...

Every time you move your eyes or blink, your pupils "reset", leading to small changes in their size over the course of a second or two. In their new paper, Mather and Cavanagh provide compelling ...

Please provide your email address to receive an email when new articles are posted on . ATHENS, Greece — In this Healio Video Perspective from the ESCRS winter meeting, Pavel Stodulka, MD, PhD ...

Other muscles are arrayed in more intricate patterns, such as the circular bands of sphincter muscle in the iris that work ...

As a demonstration, they grew an artificial, muscle-powered structure that pulls both concentrically and radially, much like how the iris in the human eye acts to dilate and constrict the pupil.