Medically reviewed by Johnstone M. Kim, MD Key Takeaways The pupil controls how much light enters the eye, allowing for clear ...

Pupils with mental health problems do not get enough help, according to the National Association of Schoolmasters and Union of Women Teachers. The Royal National Institute for the Blind and the ...

Normally, a person's pupils naturally widen (or dilate) in low-light environments to allow more light into the eye. However, in a new study, researchers reported that a person's pupils also dilate ...

Brian Otieno, seven, spends most of his time watching TV and playing video games with friends. A short walk leaves him breathless and tired so he shies away from physically exerting activities like ...