Patent ID: 7431455
Filing Date: 2008-10-07
Classification: A61B

Abstract:
1. A pupilometer comprising: an optical sensor including an image capture device having an image detection surface; a sensing optical path coupling the sensor with an eye measurement location, wherein the optical path images at least a sufficient portion of a pupil and an outer iris boundary of an eye disposed at the eye location onto the image detection surface of the image capture device so that the pupilometer can determine a center of the pupil relative to a center of the outer iris boundary; a variable distance viewing target system; a variable illumination source optically coupled to the eye location; and a processor coupled to the sensor, the variable illumination source, and the viewing target; the processor having tangible media embodying machine-readable code for determining a relationship between changes in viewing distance between the eye location and the viewing target, changes in illumination of the eye location, and pupil center drift of the pupil of the eye disposed at the eye location.