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Iridology (also known as iridodiagnosis or iridiagnosis is an alternative medicine technique whose proponents claim that patterns, colors, and other characteristics of the iris can be examined to determine information about a patient's systemic health. Practitioners match their observations to iris charts, which divide the iris into zones that correspond to specific parts of the human body. Iridologists see the eyes as "windows" into the body's state of health.
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.
As opposed to evidence-based medicine, Iridology is not supported by quality research studies and is widely considered pseudoscience. Iris texture is a phenotypical feature which develops during gestation and remains unchanged after birth. The stability of iris structures is the foundation of the biometric technology which uses iris recognition for identification purposes.

Start by studying your own eyes in a mirror. Then look at the eyes of friends and relatives. Use a magnifying glass and a torch held at the side of the eye. Make a coloured copy of your own eyes or those of a friend, and compare it with the iris chart. Study the general colour pattern. Markings are much easier to detect in blue than in brown eyes. Often there will be brownish discolourations in blue or green eyes extending outward from the pupil. This area belongs to the intestines. The brown colour change indicates that there is a deterioration of the digestive system, usually associated with inherited liver and gall bladder weakness.
Frequently, the eyes of babies change from blue to brownish within days or weeks of the baby's introduction to cows' milk. Often allergy symptoms are present simultaneously, for example, eczema, respiratory and digestive difficulties. These colour changes may also occur in breastfed babies if the mother uses cows' milk or its products. Presumably this change may already occur in the foetus.
The brown colour of genuinely brown eyes comes from melanin pigments, while pathological brown colour changes originate from oxidised lipoproteins (for example, lipofuscin) and possibly from the breakdown products of blood colouring agents (for example, bilirubin). Additional discolouration may result from drug deposits.
Sometimes there is so much brown it is difficult to detect the original colour. Organ areas that border the intestinal ring where it shows strong markings are likely to suffer from reflected weaknesses. White in the iris indicates overactivity, irritation, acidity, infection, inflammation or catarrh of the corresponding body part. In some eyes the whole iris shows much white; in others it is concentrated in certain areas only.
Generally, a brown discolouration means that cows' milk products, saturated fats (all fats that are solid at room temperature), chemicals and stimulants should be avoided as much as possible. A very white discolouration indicates mucus congestion. Therefore, mucus-forming foods should be avoided - gluten, refined carbohydrates, wheat, lactose, oranges and anything mouldy.
Gradually, an organ may change from an inflamed to a chronically weak condition. The white in the iris will simultaneously change to grey; the darker the grey, the weaker the organ. During health improvement you may watch the reverse process: the grey areas becoming lighter in colour, then white and finally restored to the original colour - a process that takes many years.
Add by http://www.iridologi.8k.com/petamata.htm , http://en.wikipedia.org/wiki/Iridology