PUPIL By N., Sam M.S. - 13 In biology, the aperture that allows light to enter the eye. The size of the opening is controlled by muscles comprising the iris. PUPIL: "His pupils were dilated before the eye exam." Related Psychology Terms Developing a Case Study FREUD, SIGMUND (1856-1939) Hitler and Conformity OBSESSRVE-COMPULSIVE REACTION SCHIZOID PERSONALITY (Schizo- thymic Personality) READING DISABILITY (Paralexia, Dyslexia) SULLIVAN, HARRY STACK (1892- 1949) JUNG, CARL GUSTAV (1875-1961) ANTISOCIAL REACTION NEWBORN INFANT (Neonate) Cite this page: N., Sam M.S., "PUPIL," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/pupil/ (accessed July 2, 2022).