This article describes the first U.S. color vision test, which was developed during World War II through the initiative and pioneering dedication of a remarkable man -- Dr. Israel Dvorine. We ...

Contrast sensitivity is an important part of healthy vision and is needed for daily tasks. Learn about the causes, symptoms, and diagnosis of contrast sensitivity loss.

How do humans perceive color? An NIH experiment finds a way to measure what happens after light hits the eye—using brain scans.