Monitoring and modeling of pupillary dynamics

The aim of the current study is the conception of a tool to analyze the pupillary dynamics. The reading of the pupil motion is a well-known method that provides functional information about the autonomous nervous system. The monitoring is made up of three parts. First, a digital camera is chosen for the image acquisition because of its simple use at the patient´s bed and its low cost. Then a software estimates the pupillogram, i.e. the plot of the pupil area versus time, from the digital video sequence using deformable templates. And finally, the pupil light reflex (PLR) is modeled by a second order linear system to compute characteristic parameters. They can be used to diagnose various affections from a statistical analysis.