Iridology versus homeopathy

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Iridology is not very big in South Africa. I have only come accross a few articles about it. I heard on the radio, an American lady was conducting a weekend seminar at a nearby location and was really excited to go. Unfortunately I was too late for the tickets. I believe the study of iridology is quite big in other countries. How different is it from homeopathy? Would love to hear what others think about it.