Electro-optical alertness monitoring apparatus

摘要

Apparatus for monitoring the eye of a subject comprising: apparatus (10, 12) for directing infra-red radiation at the eyes of a subject; apparatus (22, 24) for sensing infra-red radiation retro-reflected by the retina through the cornea of the subject; and apparatus (28) for providing a sensible output indication in the absence of expected received retro-reflected radiation, indicating the closing of the subject's eyes or direction of his eyes outside of a desired angular region.