Figure 1.

Diagram of the chromatic pupillometer apparatus. One eye is stimulated with colored light (blue or red) and the pupil response is recorded on the consensual eye by an infrared video camera under infrared illumination. The light stimulator is time locked to the recording system which is computer-controlled. During the pupil recording, real-time pupil movements can be observed on the LCD monitor and at the same time in graphic form on computer screen. IR, infrared; LED, light emitting diodes.