Swedish researchers from Orebro University found that subjects with more crypts (pits) on on their irises were likely to be tender, warm and trusting. The link may be genetic and physiological as the Pax6 gene causes changes in both the iris and the anterior cingulate cortex of the brain which is an area which regulates empathy and emotion. So our eyes may well be the window to our souls!
Iris crypts and other features are unique to each eye and person. The chance that 2 eyes have the same iris pattern is 1 in 3 493 000 000 000 000 000 000 000 (there are only 14 000 000 000 eyes on earth). So iris recognition is used for identification at airports and in laser eye surgery to ensure that your laser treatment is correct and unique to you personally (click to read more ...).
The diversity and uniqueness of our eyes reflects the the diversity and uniqueness of our genes, personalities and souls.