Why do I see everything in blue?

[Gnisy]

I have no idea where to put this question but.. picture this: I was starting to nod off on a cozy car ride. I open my eyes after a few minutes and everything I see is in blue or rather, in a shade of blue. What's going on? If I do it intentionally when I am not tired, there isn't much of a difference. Again, why?

[tony1941]

Let me guess; it was a sunny day (?) This could be caused by the "auto colour balance" effect of the human eye. While your eyes were closed, the sun was shining through your eyelids and the illumination reaching your eye was therefore very red due to the blood in the eyelids. When you open them, your eye/brain combination attempts to correct what you see and overcompensates towards the blue end of the spectrum. This colour compensation is the reason why your photos often have a really red cast if taken indoors without flash, and yet you see the scene as being normally coloured.

[stevie21]

I suppose this is the same reason that optical illusions like these work : your brain becomes more (or less?) sensitive to something if you stare at it for long enough.
http://www.eyetricks.com/jesus.htm

[Peter Pedant]

you werent driving were you ? - and they werent the police hahaha

Yellow vision is xanthopsia, so i suppose you had cyanopsia....

not significant......IMHO

[Peter Pedant]

well you can google cyanopsia and you can get:

http://www.psych.ucalgary.ca/pace/va-lab/Brian/acquired.htm

which is kinda betta value than my posting.

[KebabMeister]

As stevie mentioned, if I stare at something for a long time (indoors) then I can make the side of my vision to go blueish which then slowly comes in to full vision.