You look in the mirror and notice that the dark circles in the middle of your eyes are bigger than usual. What's going on? Those dark circles are your pupils, the openings that let light enter your ...

The dark part of your eye is called the pupil. Pupils can grow or shrink according to different lighting conditions. Other factors, such as drugs, can also affect pupil size. Read on to find out which ...

Pupils expand when there are more objects to look at. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Your pupils might be able to count … sort ...

Dilated pupils mean that your pupils appear larger in size. The most common reason for dilated pupils is low light in a dark room since lower light causes your pupils to grow. Dilated pupils are also ...

Many factors can influence pupil size. Typically, the pupils open up in low light situations to let in more light. However, some research suggests that attraction and mood might also cause pupil ...

The size of your pupils varies throughout the day, but most people’s pupils fall within a particular size range. We’ll look at when and why your pupils change size. First, the range of “normal” pupil ...

Amanda Meyer is affiliated with the Australian and New Zealand Association of Clinical Anatomists, the American Association for Anatomy, and the Global Neuroanatomy Network. Monika Zimanyi is ...