The pupils, both girls and boys ... and that the purpose of his method was to check for “secondary sexual characteristics.” “It is the position of a professional to check for (children ...

Typically, the pupil contracts and dilates depending on ... and ophthalmologists use it to check on the optic nerve. But it isn’t only light that affects its behaviour. Since the 1960s ...

Researchers were able observe eye movements during sleep over a course of several hours for the first time. Pupil size also fluctuates constantly during sleep, and is linked to the level of brain ...