What causes eyes to change colour?

Subject: What causes eyes to change colour?

Date: Mon May 24 15:42:02 1999
Posted by Minh-Duc Nguyen
Grade level: 10-12 School: General Vanier Secondary School
City: Cornwall State/Province: Ontario Country: Canada
Area of science: Anatomy
ID: 927578522.An

Message:


I understand atmospheric latitudes can explain why certain eye 
colours are prevalent in a region.  But what I ask is more 
simple, although I can't seem to find the answer on my own:  I 
am ignorant as to why eyes temporarily change colour.  For 
example, after a good cry, I notice blue-eyed friends often 
appear to suddenly have green eyes.  Is that a biochemistry 
reaction affecting the iris?

Re: What causes eyes to change colour?

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