"Miosis" is a medical term that describes the constriction of the pupils. Learn its causes, symptoms, and how to treat it.

Do you have dark brown hair and brown eyes? Then you have something in common ... melanin is in the iris (the colorful ring around your pupil) by controlling how much P protein is produced.

Since childhood, I’ve harboured resentment against my eye colour. So dark brown that they almost blend into my pitch-black pupils. It’s boring to be one of between 55% and 79% of people with ...