University of Delaware psychologists say that jealously may literally impair vision.

In a recent study published in Emotion, the researchers found that women who were made to feel jealous were so distracted by unpleasant emotional images they became unable to spot targets they were trying to find.

It has long been known that the emotions involved in social relationships affect mental and physical health, but these results extend the relationship a step further, to the point that emotions affect what we see.