eye tracking systems by Arrington Research, Inc.

Torsion Measurement

Ocular Torsion
Torsion is the rotation of the eye-ball about the line of sight, i.e. rotation about the z-axis. ViewPoint measures torsion in degrees of rotation and stores the values in the ASCII format data file, or accessed real-time from other applications. Real-time feed-back can also be shown in the PenPlot window.