Let Me Look Into Your Eyes: Have You Heard of Iridology?
Iridologists use the charts to distinguish between healthy systems and organs in the body and those that are overactive, inflamed, or distressed. Iridologists believe this information demonstrates a patient's susceptibility towards certain illnesses, reflects past medical problems, or predicts later health problems.
Iridology is not supported by quality research studies and is considered pseudoscience and quackery by most medical practitioners and eye care professionals.
wikipedia iridology
http://en.wikipedia.org/wiki/Iridology

This is something new for me. So I can understand the "quackery" involved.
"Crystal balls better look out for Eye balls!"
OOOOOOooooooo...Laughing!