Eye of the Beholder?

Your eyes might be the key to the winter blues

If you're sad just because it's winter... The problem may be due to a mutant gene in the eye. 

Millions of Americans suffer from what's called seasonal affective disorder.  A kind of winter-time depression that's sometimes treated by putting them in front of bright lights. 

Now scientists at the University of Virginia have discovered a genetic abnormality in the eye.  They say it makes people less sensitive to light... So that everything in the daylight-shortened winter appears even more drab than usual. 

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