Like most human traits, blue eyes are determined by genes, and no two people have exactly the same hue. It works a lot like individual fingerprints, making our eyes two of the most distinctive parts ...

Eye color depends on the iris ... action when it squeezes or relaxes to let in more or less light through the pupil. The iris is made up of two layers. For almost everyone - even people with ...

IN the past many investigations have been carried out on the static and dynamic reactions of the human pupil to illumination of the eye using white light. In this respect it seems surprising that ...

(Interestingly, different animals have different color tapeta ... which is why so many nocturnal eyes have slit pupils. These apertures can be vertical, horizontal, or diagonal.

pupil movement might one day be used to detect disorders such as insomnia and post-traumatic stress disorder, or even a comatose patient’s recovery. We haven’t yet figured out if eyes are ...