Psych M.D. - Iris


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Term: Iris
Definition (Myers): a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening1
Definition (alternative): the colored part of the eye; controls light levels inside the eye similar to the aperture on a camera; embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size.2
Contextual explanation: the muscle that changes the size of the pupil, which is the hole that allows light to pass through; the iris is the colored portion of the eye, which is determined by ones genetic information
Related terms and concepts:
Iris 134
Related websites:
Sources:
  1. Myers , D.G. (2003). Psychology Seventh Edition . Holland, Michigan : Worth Publishers .
  2. St. Luke, (1996). Iris - eye anatomy. Retrieved September 23, 2009, from stlukeseye.com Web site: http://www.stlukeseye.com/anatomy/Iris.asp
  3. NCBI, (1999). The eye and eye conditions - NCBI. Retrieved September 23, 2009, from NCBI Web site: http://www.ncbi.ie/information-for/education-professionals/the-eye-and-eye-conditions
  4. Patrickshackleford. (Producer). (2007, January 23) The Human Eye [educational video]. Retrieved September 23, 2009 from http://www.youtube.com/watch?v=JunCyiGfreo
Edited by: Daniel
Date of last edit: 9/24/09



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