Usually, the pupils in each eye dilate or constrict simultaneously. When they do not, the pupils may appear to be different sizes. In this article, learn about the possible causes for pupils of ...

Scientists have long studied the size of our pupils to understand attention, emotion and even medical conditions. But now, new research has surprisingly revealed that they change size in sync with our ...

It’s also well established that our pupils constrict when focusing on a nearby object, and dilate in response to cognitive effort or emotional arousal. As the German pupil-research pioneer Irene ...

By 31 weeks, the pupils can constrict, dilate, and detect light. Your baby will develop the main parts of the eye early in the first trimester. Around 10 weeks, they'll start to form light ...