The Ideas i share come from reading a few iridology sources, listening to Aajonus Vonderplantiz's Q&As, and some forums.
Knowing iridology is cool because you can use it to assess someone's health or illness. As soon as you meet someone, you can tell their health status by looking at their irises.
The iris's fiber count comes first. Your constitution will be better and you will be a better person overall if you have more of them. A weaker constitution has fewer living cells. In certain Q&A sessions, you could hear Aajonus talk about the proportion of living cells that his clients would have.

This is a picture of iris with the fibers. You can see them going from the center of the eye to the sides. The more of them there are, the better you are
According to Aajonus, amber and blue are basically the two types of real eye colors. I think green is too, but that's only speculation at the moment because there isn't enough research on the subject. Everything else just shows that the body is poisonous, and the iris will eventually revert to its original color if the diet is followed to for a sufficient amount of time.
This is an image of the iris chart. When you use it to cover your iris, you can see which areas are toxic, stronger, and weaker. The following areas are accurate in this chart: skin, stomach, gut, and brain. There are more general charts as well, but this one is more detailed and focused.
