Importance

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Abstract

A system for determining whether an eye within a field of view is closed for a predetermined period of time and for distinguishing between reflections from an open eye and any specular reflections within the field of view. The system comprises detection apparatus for viewing the field of view. Also included is a first light source positioned so that light arising from the light source causes reflections from both an open eye and from any specular reflectors within the field of view to be detected by the detection apparatus. The system further includes a second light source positioned so that light arising from the light source causes reflections from the open eye to be directed so as not to be detected by the detection apparatus and so that light arising from the light source causes reflections from any specular reflectors in the field of view to be directed so as they are detected by the detection apparatus. The detection apparatus comprises apparatus for comparing over a predetermined period of time the number of reflections arising from the first and second light sources. If the number of reflections arising from the first and second light sources during the predetermined period of time are equal, it is assumed that the eye was closed for the predetermined period of time.

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First Claim