“…iridology is of no value in diagnosing patients. Iridologists had no better than chance percentage of correctly diagnosing a patient and would often give a false-positive, diagnose them with a disease that they didn’t have, which could cause a patient mental anguish as well being financially expensive. More dangerous of course are false-negatives, not picking up on a disease they suffer from. For these people, seeing an iridologist could delay the proper medical diagnosis of their disease which, worst case, could prove fatal.” Skeptical Say How blog (19th January 2010)