i tried to answer my own question!

i dont know how good this info is!!! i found it on scroogle!

'A blue or dark ring at the periphery of the iris indicates a sense of special purpose, Constantly searching for their mission in life through diligence and commitment, they are capable of anything. Unclear how to achieve their objective and focus their action, they can experience indecisiveness and stagnation.'


http://www.kindredspirit.co.uk/articles/1329-iridology.html


from Iridology by Sarah Bunting, D.Th.D., MBRI, the article originally appeared in 1990 in Issue 13 of kindred spirit
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