Cooperative eye hypothesis Cooperative eye hypothesis The cooperative eye hypothesis is a proposed explanation for the appearance of the human eye. It suggests that the eye's distinctive visible characteristics evolved to make it easier for humans to follow another's gaze while communicating or while working together on tasks. Unlike other primates, human beings have eyes with a distinct colour contrast between the white sclera, the coloured iris, and the black pupil. This is due to a lack of pigment in the sclera. Other primates have pigmented sclerae that are brown or dark in colour. There is also a higher contrast between human skin,
The Eye of the Beholder covered by bandages, dub the single line spoken by Tyler when she is revealed, portrayed by the actress Donna Douglas. However, Douglas had been listening to Stuart's voice as she recorded her part, and was able to imitate her so successfully that she was allowed to speak the line on camera herself. The original title for this episode was "Eye of the Beholder." Stuart Reynolds, a television producer, threatened to sue Serling for the use of the name because at the time he was selling an educational film of the same name to public schools. Reruns following the initial broadcast