|WikiProject Anatomy||(Rated Start-class, High-importance)|
Article Improvement Drive
Animals using their eyes...
Humans with naturally dark sclera
I think it's worth mentioning in the article that many individuals with dark skin exhibit naturally dark sclera (usually of a yellowish or brown tint, but sometimes orange), and this is a natural, benign condition. There are relatively few references on it, and this is on of the only I have ever come across: http://www.knowswhy.com/why-do-africans-have-yellow-eyes/
I've also read this is due to an excess of melanin in the eye, which is why you primarily see it in individuals with very dark skin, which seems more likely than the claim it's due to subconjunctival fat. Sadly, the most common reference I've found (mainly in old texts) is that this some "primitive" trait comparing it to the dark sclera of gorillas (which are usually jet black), even though one can observe it in very dark skinned humans across the world, even in non-africans. It would be helpful if someone could incorporate more extensive, verifiable references on this, if they do exist. — Preceding unsigned comment added by 18.104.22.168 (talk) 01:26, 10 September 2014 (UTC)