New study shows depression sufferers see world in shades of gray

Research from Harvard University reveals that depression affects the vision of those who suffer from the condition.

A recent study published in the Harvard Mental Health Letter shows that people who suffer from depression often see the world in shades of gray. For the study, researchers placed electrodes near the eyes of participants as they were shown a series of checkerboard designs with varying degrees of black-and-white contrast. Investigators then recorded retinal activity.

They found that depression sufferers were less able to detect differences in black and white, while those who suffered from severe depression registered the lowest levels of activity in the retina.

Experts say that those who suffer from the condition often exhibit feelings of hopelessness, pessimism, guilt, worthlessness, helplessness and loss of interest in hobbies and activities they once enjoyed. Furthermore, if left untreated, individuals can develop suicidal tendencies.

According to the National Institute of Mental Health, nearly 7 percent of the U.S. population suffers from depression. Mood disorders including, depression are among the leading causes of disability in America.