1. A method for tracking an eye in eye movement space, the method comprising: providing a means for illuminating the eye; providing a means comprising multiple sensors for acquiring stereo images of the eye from different spatial perspectives; acquiring stereo images of the eye using multiple sensors; isolating internal features of the eye from the stereo images acquired from the multiple sensors; isolating specular reflection points on a corneal surface of the eye, the specular reflection points resulting from reflections of light emitted from a plurality of light sources sequentially used to illuminate the eye; computing a center and radius of the spherical corneal surface using the specular reflection points; calculating three-dimensional coordinates of the isolated internal features within the eye by performing ray tracing; matching features across stereo images that are acquired by separate sensors, wherein the matching process makes use of the distribution of the features about apparent pupil elements common to both images wherein performing ray tracing comprises computing feature locations from intersections of stereo-matched rays, wherein the stereo-matched rays have been derived using a refractive computational process; and determining an eye gaze direction relative to the isolated internal features.