1. An apparatus for monitoring eye movement in a patient, the apparatus comprising: a frame structured to be worn on the head of the patient; an infrared illumination device supported by the frame, the infrared illumination device structured to illuminate an eye of the patient; a camera supported by the frame, the camera structured to capture images of the eye when illuminated by the infrared illumination device; a luminance sensor structured to measure ambient luminance supported by the frame, the luminance sensor structured to generate data relating to the measured ambient luminance; and a data storage device associated with the frame for recording the measured ambient luminance and for recording the images and additional data relating to one or more characteristics of the patient or environment along with time information associated with the measured ambient luminance, the recorded images and the additional data; wherein the apparatus is structured to generally not obstruct the patient's view of their surroundings.