The Red-eyed Vireo is a small bird, olive-green above and pale yellow and white below. It has no wing-bars. It has a rather flat head with a blue-gray crown, bordered below by three stripes: black, white, and black, with the lowest stripe passing through the eye. Although adults have bright red eyes, the color of the eyes is often difficult to detect in the field. The eyes of juveniles are brown, a color that may persist through the first winter.