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There seem to be various conditions that affect the color of the outer edge of the iris, such as:

and I imagine there are others.

Generally they can indicate an underlying medical condition (e.g. the Fleisher ring is indicative of Keratoconus).

The limbal ring is said to indicate good health, but I couldn't find any hard citation for this:

https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Blue_eye_2.jpg/800px-Blue_eye_2.jpg

What is a list of all such rings, and methods for distinguishing between them?

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