Self-aligning unobtrusive active eye interrogation

A system for controlling the sensing of information from an eye of a subject, comprising:

• signal processing circuitry including:
• a gaze signal input adapted to receive a gaze signal containing information indicative of a gaze direction of the eye of the subject sensed from at least the eye of the subject;
• a response signal input adapted to receive a response signal sensed from the eye of the subject by a response signal sensor responsive to delivery of an interrogation signal to the eye of the subject;
• a response signal processor configured to process a response signal sensed from the eye of the subject to determine a physiological parameter from the response signal;
• a gaze signal processor configured to determine the gaze direction of the eye of the subject based upon the gaze signal;
• an alignment detector configured to determine whether the eye of the subject is in alignment with respect to at least one of the interrogation signal source and the response signal sensor based at least in part upon the gaze direction;
• and
• an actuator controller configured to:
• determine a target position for at least one of the interrogation signal source and the response signal sensor based at least in part on the gaze direction;
• and
• generate an actuator control signal to cause the at least one actuator to adjust at least one of the interrogation signal source and the response signal sensor to bring at least one of the interrogation signal source and the response signal sensor into alignment with the eye of the subject.

A system comprising:

• a housing;
• an interrogation signal source housed in the housing and adapted for delivering an interrogation signal to an eye of a subject, the interrogation signal source including at least one light source and at least one optical system;
• a response signal sensor housed within the housing and adapted for sensing a response signal produced by the eye of the subject responsive to the interrogation signal, the response signal containing information regarding a physiological parameter of the subject;
• an input structure adapted for receiving an input signal;
• at least one actuator configured to adjust at least one of the interrogation signal source and the response signal sensor based at least in part upon the input signal to bring at least one of the interrogation signal source and the response signal sensor into alignment with the eye of the subject;
• an output structure adapted for transmitting an output signal;
• and
• mounting means adapted for mounting the housing with respect to a display in such a manner that the interrogation signal source and response signal sensor are alignable with the eye of the subject during normal use of the display by the subject.