SELECT A TOPIC ON THE HUMAN EYE ILLUSTRATION TO LEARN ABOUT THE TOPIC! THE HUMAN EYE: IRIS Diaphragm that controls the size of the pupil (an opening that lets light in). Many people believe the iris is the colored part of the eye. Actually, that is the choroid, a pigmented layer beneath the sclera (white of the eye).   ADDITIONAL INFORMATION ASTIGMATISM | NEARSIGHTED - MYOPIA | FARSIGHTED - HYPEROPIA | PRESBYOPIA   © 2005-2008 VISIONFOREGOLFING.COM AND TIMED DESIGNS, INC. ALL RIGHTS RESERVED