Thyroid Sign - Lx - (mega)

This person was affected by thyroid dysfunction, could you identify which iris sign indicate about this genetic weakness ? Try it !
I know it will take some time to find it, but if you are slightly familiar with my common practice, you should manage to find it out ! This is an illustration of where there are no sign to indicate the genetic weakness, and silence in ciliary, humoral and pupillary zones. I will reveal this related sign latest by this Saturday.. 

Squared sign IPB located at the ventral section of the inner pupillary birder tissues, it predominantly indicate family history and individual genetic inherited of thyroid dysfunction tendency !