As we know, traits are affected by genes, epigenetic factors and environment. For example, as for fingers, position of the fetus in uterus and the flow of amniotic fluid around the fetus determine the fingerprints. In addition, we know that the left and right irises texture of a person are as different as irises of unrelated people. I want to know how it is possible to have different left/right eye texture when the genome and epigenome of both eyes of the same person are identical. Could this be resulted from the aqueous humour flow?
Saeed, this is a very interesting question to put to those of us in the new science of Eyology--which is an outgrowth of Iridology. At this time, I do not believe anyone has a clear answer. Of course, some of us have been studying Eyology for many years (in my case, 47 years) and greatly enjoy it. But, this question has not seemed so important to us when considering what we do with irises. Here (
https://www.cl.cam.ac.uk/~jgd1000/anatomy.html) is a reference re the anatomy and physiology of the iris that considers characteristics that you may already know. The patterns in the irises are complete by eight months in utero. While color has been studied for quite a while, the texture and viability of same have not. Eyologists have contented ourselves with the heritability factor. We see all the time these structural (textural) patterns, e.g., passed down thru generations. A Lacuna, e.g., shows up at 3 o'clock in the left iris (arterial heart area) of the child of a mother who had heart disease. We expect it. But exactly how the Lacuna occurs is another thing, thru the embryonic stages, what exactly the mechanisms are--I don't think anyone currently knows.
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