I don't think that iridology itself can bring about change it is a diagnostic tool and a very valuable one. The iris shows what is going on in the body, I have noticed that my iris is very cloudy and can get dark in bad health and since I have been using holistic practices it has been clear blue. I believe it is true 'the eyes are the windows to the soul'.
super

YEs it can...but more has to do with the relationship of emotions to certain organs.
the analysis of the veins in the whites of eyes (Sclerology)is more direct to emotions.

Say that an impaired liver is linked to anxiety, and you are anxious. Then you know you really need to work on your liver.

Also, the ayurvedic analysis of iris says alot more about emotions than the typical iridology.