Figure 4

Typical pupil reflex of a healthy volunteer after a 10-ms light flash intensity of 250 cd was triggered at zero second. The indicated parameters are defined as follows: 1-Latency time to reach the plateau at 75% of pre-flash pupil radius; 2-Latency time to the beginning of constriction; 3-Duration of constriction; 4-Latency to the largest constriction; 5- Radius of pupil on reaching the plateau; 6-Radius of pupil at largest constriction; 7- Radius of pupil before flash.