As our eyes encounter screens, our pupils constrict or get smaller, a process called miosis. “That’s the equivalent of squeezing a fist,” Applebaum maintains. And just as it is crucial to ...

Medically reviewed by Johnstone M. Kim, MD Mydriasis occurs when the pupil remains dilated (widened) and doesn't respond to light changes in an environment. It can happen due to an injury, medications ...