Apparatus for observing reaction of the pupil of an eye includes a first light source for generally illuminating the eye, and a second light source which may be selectively actuated to direct light to the eye in the area of the pupil. The reaction of the pupil to this application of light from the second...http://www.google.se/patents/US3966310?utm_source=gb-gplus-sharePatent US3966310 - Pupillometer and method of use thereof
