Eye Motion Analysis

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Introduction

With eye movement analysis systems it is possible to record eye target and following movements. On the basis of these measured variables, it is possible to draw conclusions about the distribution of attention and the information processing of the test person and to evaluate the design of products and processes with regard to their usability. The IAD has three current eye-tracking systems for recording eye movements.

Technology

The recording of eye movements in eye-tracking systems is basically done by video-oculography. Here, the eye movements are determined by means of video recordings. Mobile eye-tracking systems have cameras that film the subject's eyes as well as a scene camera that records the subject's surroundings.

To detect eye movements, an infrared light beam, which is not perceptible to humans, is projected through the pupil onto the retina. The cameras detect the pupil as well as the reflex points of the infrared beam on the cornea. The relative distance between the two points can then be used to determine the eye movement.

The IAD has two mobile eye-tracking systems for glasses. These mobile systems are mostly used when the mobility of the user must not be restricted, for example during examinations in vehicles or during process analysis in factories. Furthermore, the institute owns a fixed system for screen workstations for the analysis of graphical user interfaces.

Application

The eye-tracking system can be used in different fields of application. The video clip shows the eye behaviour during a simulated highly automated drive while simultaneously performing an activity unrelated to the drive. The red cross symbolises the current fixation of a gaze. So-called “Areas of Interest” (AoI) such as “windshield” and “tablet” can be defined as in this application case and thus the time required between the task change can be determined.