This is the 4th time i am trying to create a fully procedural Eye material using only Substance Designer. I started it again, after some time, since now i have more experience with it. Still has a LOT to improve on it, but i think now i am on the right tracks. lol
The Color part will be as tricky as the height maps... But it's a god challenge to learn and PUSh more my SD skills boundaries.
I will update that post with my progress, and if everything went well, i will turn it into another item on my Marketplace to make it available for others to use it. (My goal is to add some parameters to be able to generate unique variations of it height-wise and color-wise.