1. An eye-imaging system, comprising: a. A camera system positioned in a head-worn computer, wherein the camera system is further positioned to capture eye-image light that originates as reflections from an internal portion of an eye of a user; b. A light-source positioned in the head-worn computer such that it irradiates the internal portion of the eye of the user with a known amount of light to produce the reflections from the internal portion of the eye of the user; and c. A processor adapted to analyze a light absorption statistic based on a comparison of the known amount of light and the reflections from the internal portion of the eye of the user.