This is an A3 chart of the structure of the iris.
The structural relief relates to the way the iris sits on the eyeball. This can only be determined by viewing the iris with extreme side lighting. When the structure varies from a smooth round profile it can provide relevant information about the client. Current understanding suggests that when deviation in structural relief is observed, it is not reversible and the indications will be constitutional or lifetime tendencies.
Extract from Integrated Iridology textbook chapter 7