"Iridology is an alternative medicine practice in which patterns, colors and other characteristics of stromal fibers of the iris are examined for information about a patient's systemic health. Practitioners match their observations to iris charts which divide the iris into many zones believed to correspond to specific parts of the human body. Little if any rigorous scientific evidence exists confirming any such link between aspects of the iris and a patient's state of health and there is no recognized causative mechanism for any purported correlation." Includes a look at the history of iridology, methods used by iridologists, support for iridology, criticism of iridology, and scientific research into iridology. (Wikipedia)