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What is the name of a phenomenon where one of the human eyes is seeing brighter/more saturated color than the other? I can observe the same object from the same position while alternating which eye is closed, and there's a visible difference in the saturation of color. Like one color is more pale than the other.

Here's an example of what the difference looks like between image perceived by two eyes:

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up vote 1 down vote accepted

here is forum discussing similar effect ,

where as similar problem which leads to double vision is single eye is called monocular Diplopia.

There are two possible causes discussed in that forum. One is a cataract or an early indication of a cataract, for which a vision specialist visit is recommended.

Another solution is much simpler one of the pupils is more dilated than the other:

The way your eyes see colors changes throughout the day, not dependent only on external conditions. Try this: gently press the palm of your hand against one eye (closed), for about a minute; leave the other eye open during this time (feel free to blink, of course...). Now, look at the world with one eye covered (for a couple of seconds), then the other — the eye you help closed will see things as quite more saturated, partly because you've fostered its pupil to dilate in the time during which it was shut. I recall being confused by this when I first started noticing that, upon awaking, either eye would see colors differently from the other; simply, the eye rested on the mattress would be seeing colors with greater saturation.

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Could you add some details to your answer useful to the questioner, in case that link goes away in the future? –  kmm Jul 11 '13 at 9:44
    
I also noticed this phenomenon after laying on a mattress with one side of my head against the mattress. I don't recall which side had most brightness, but the answer sounds correct –  Alex Stone Jul 11 '13 at 22:09
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