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I have heard of a case of iritis in celiac disease.  This was (if i
recollect properly) autoimmune in nature.  The treatment is determined by
the eye condition itself.. the coexistence of the two conditions does not
alter the treatment of either.  Interestingly Iritis is also seen more
frequently in ulcerative colitis.  Joe Murray
PS if I find the original citation I will post it.