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How Depression May Make the World Seem Gray

Depression is often referred to as “the blues.” Research suggests it should actually be called "the grays."

To someone who is depressed, the world can seem flat or dull. This was long thought to be purely psychological. It turns out, though, that depression may affect how the eyes function — altering visual perception in a way that actually makes the world look gray, according to the Harvard Mental Health Letter.

In a study, researchers placed electrodes near volunteers’ eyes as the volunteers viewed a series of checkerboard patterns with varying degrees of black-and-white contrast. The electrodes recorded electrical responses in the retina, the part of the eye that reacts to various wavelengths of light and then transmits electrical signals along the optic nerve. The brain interprets these electrical signals as color, shape and contrast.

Volunteers with major depression were much less able to detect differences in black-and-white contrasts on the checkerboards than were volunteers who weren't depressed. The most severely depressed volunteers also registered the lowest levels of activity in the retina.

Dr. Michael Miller, editor in chief of the Harvard Mental Health Letter, noted that this study suggests that impaired contrast perception may explain why the world seems gray when people are depressed. Further research is necessary to replicate the findings, and to determine what other factors may contribute.

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