Is there a term for this?

Question

Is there a scientific term for the dark outer ring found around some irises?

Sorry if this question is not in the right category; I wasn't sure where to put it.

I forgot to clarify: I'm talking about eyes, not flowers.

Answer 1

The area nearest the pupil, from the pupil border to about the mid point, is the pupillary. The region from the mid point to the outer edge or iris root is the ciliary. The boundary between the pupillary and the cilary is the collarette.
http://cancerweb.ncl.ac.uk/cgi-bin/omd?ciliary+zone
In some individuals the iris can be light in the pupillary and dark in the cillary or even have different colors in the two regions. Heterochromia iridis means 2 different colors in the same iris.
http://www.milesresearch.com/main/eyesigns.asp#centralheterochromia

Answer 2

That is a very good question indeed but the answer is nowhere to be found maybe the scientist have over looked it but if u want sum other part of the on google just go 2 google and type in anatomy of the eye maybe u'll find it!!

Answer 3

If there is a white opaque ring around iris thats called 'arcus senilis'
it is generally seen in aged people also in some juveniles.

But it is not dark and sorry to say in my book of opthalamology there is nothing such described.

Answer 4

I dont know if there is such a term, but you can check the information on IRIS in wikipedia with the link below.

Answer 5

Kayser-Fleischer ring

Answer 6

i think there is no such term if i found out later i will update

Answer 7

it is in the right catagory but sorry i dont know the answer but iam sure you can find it on google somewhere