How come when we first open our eyes from a nap there is sometimes a blueish tint to everything?
In: Biology
Your eyes process all colors based on a balance of three types of light – red, green, and blue. White light, and all colors of light that you can see, are made from a combination of these three. There are special cells in your eyes that react to each of those colors, and from those three, your brain can make all the colors you can imagine.
If you’ve been sleeping in a lit room (such as you might if you nap in the daytime), the light has been filtering through your eyelid’s blood vessels. You may have been asleep, but the cells in your eyes that process the color “red” have been quietly working the whole time. You simply didn’t notice because you were asleep.
By the time you wake up and open your eyes, the green and blue-processing cells will be refreshed and ready to go, but your red-processing cells will be tired.
As a result, green and blue light will look brighter to you. But don’t worry, your red-processing cells will be fine! Your eyes make up for different light conditions all the time.
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