People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their ...

The pupil controls how much light enters the eye, allowing for clear vision. In low light, pupils widen to let in more light, and in bright light, they narrow to prevent too much light from entering.

Medically reviewed by Diana Apetauerova, MDKey TakeawaysAnisocoria is when the pupils of your eyes are different sizes.