University of Tampere
Department of Computer Sciences
Tampere Unit for Computer-Human Interaction

INDEX RESEARCH PEOPLE PUBLICATIONS ACTIVITIES LINKS internal

index :

: equipment

Our eye tracking devices

We currently have four video-based eye tracking devices:

Tobii 1750

We got the Tobii 1750 eye-tracker in 2004. We have used Tobii, e.g., to study the usability of web search engines.

Specifications:
Sampling rate: 50Hz
Gaze position accuracy: 0.5 degrees
Freedom of head movement: 30 x 15 x 20 cm at 60 cm from the tracker
Features: binocular, long-lasting calibration
For more info about Tobii, see Tobii web pages.

Tobii 1750 is integrated with 17" TFT display.

[top of page]

SMI iView X

We got the SMI iView X remote tracker in 2002. We have used iView X, e.g., to study eye typing.

Specifications:
Sampling rate: 50Hz
Gaze position accuracy: 0.5-1 deg
Tracking resolution, pupil/cr: 0.1 deg
Operating distance subject-camera: 04.-1.0 m
Head tracking area: 40 x 40 cm at 80 cm distance
For more info about iView X, see SMI web pages.

iViewX is small enough to be placed besides the monitor.

The eye and the gaze path are illustrated in the iView X operator monitor. The system tracks the center of the pupil (black crosshair) and the corneal reflection (white crosshair). This photo was taken when the user was reading text.

[top of page]

EyeLink

We have had the head-mounted EyeLink since 1999. It has two cameras so it can monitor both eyes at the same time. We have used EyeLink, e.g., to study how people read foreign text, and for usability testing.

Specifications:
Sampling rate: 250 Hz
Gaze position accuracy: 0.5-1.0 deg average
Eye position tracking range: +/-30 deg horizontally, +/-20 dec vertically
Gaze position gracking range: +/-20 dec horizontally, +/-17 vertically (with head tracking)
Pupil size resolution: 0.1% (0.01 mm change detectable)
Working distance: 4-7 cm camera-to-eye distance. 40-140 cm display-to-eye working range.

In the left image, a user is reading text. The boundaries of the words are visualized in the operator monitor (right), together with two spots for the eyes.

Eyelink came with a cool glasshead rack.

[top of page]

ASL 4250R+

We purhased the ASL tracker in 1996. The ASL tracker is a remote, floor-mounted, eye tracking device. We have used it, e.g., to study how people read menus, or how affective stimuli affects the pupil size.

Specifications:
Sampling rate: 60 Hz
Precision: 0.5 deg
Allowable head motion: +/-15 cm vertical and horizontal
Allowable eye movement: 40 deg horizontal, 35 deg vertical
Eyeglasses/contact lens: most are accepted
Eye to camera distance: 50-225 cm

The ASL eye tracker is placed under the monitor (left) in the usability lab. The operator can monitor the eye movements and make sure the eye and the pupil are tracked properly (right).

[top of page]

iComponent software

The eye trackers came with some basic analysis and visualization tools, but we are also developing our own tools for gaze path analysis. The picture above is from our own tool. Currently, the prototype works with Tobii, SMI iViewX and EyeLink. In the future, we hope to develop the application to be a general tool for eye movement data collection, analysis, and visualizations, a tool that can be used by anyone with any tracker that has a driver for it.

[top of page]