Eye Motion Analysis

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Introduction

With eye movement analysis systems, it is possible to record gaze target and follow-up movements. These measurement variables can be used to draw conclusions about the distribution of attention and the test person's information processing, and to evaluate the design of products and processes in terms of their usability. The IAD has three eye-tracking systems for recording eye movements.

Technology

The recording of eye movements in eye-tracking systems is basically done via 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 eyeglass eye-tracking systems. 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 gaze behaviour during a simulated highly automated drive while simultaneously performing a non-driving-related activity The red cross symbolises the current gaze fixation. So-called “Areas of Interest” (AoI) can be defined, such as the “windshield” and “tablet” in this use case and thus the time required between task changes can be determined.