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Because he's unlikely to have a cataract at age three, then light scattering by the tapetum layer seems more likely:
(Google is your friend.)
Good read, I've seen green and often gold, but had not run across blue untill now. I had thought that the green was the same effect as that from an IR beam on white paper and assumed what I saw was the IR component (like what you would see with night vision).
Blue I did not expect
Thanks for taking the time and providing an explanation. A couple of my nureons now have a new relationship