Tobii Pro Fusion

Reach further with your research

Our mid-range research eye tracker is versatile and powerful, capturing gaze data at 250 Hz. This screen-based system supports both fixation and saccade-based studies, inside and outside of the lab.

Breaking research barriers

Tobii Pro Fusion opens up your research possibilities, offering a powerful yet portable behavioral research solution. With sampling frequencies of up to 250 Hz, and two eye tracking cameras, Tobii Pro Fusion expands your data collection setup to more research populations, scenarios, and data requirements.

testing child in school with eye tracker

How it works

How does Tobii Pro Fusion work?

Tobii Pro Fusion Set up

Set up

Tobii Pro Fusion is compatible with a range of standalone monitors and laptop screens up to 24” in size and connects via USB. It can also be placed on a tripod for studies of real-world stimuli.

testing in a lab setting with an eye tracker


Multiple sampling rates of up to 250 Hz allow you to collect data for eye movements such as fixations, saccades, and smooth pursuit. Additionally, you can record pupil diameter and eye openness data.



Tobii Pro Fusion works with
Tobii Pro Lab, supporting researchers from experiment design to data analysis. Calculate eye tracking metrics, create visual representations of data or export for further analysis in other software.

Fields of use

For a range of scientific research

Tobii Pro Fusion provides a flexible solution that opens new possibilities in a variety of research fields. Discover how you can advance your research in:

Tobii Pro Fusion - Psychology

Psychology and neuroscience

Discover the connections between eye movements and cognitive processes to progress our understanding of human behavior.

fusion eye tracker testing on a baby

Developmental psychology

Study attention and gaze patterns, illuminating visual perception, social cognition, and language acquisition in the early stages of child development.

Tobii Pro Fusion being used in a lab environment

Clinical research

Tobii Pro Fusion allows researchers to explore biomarkers and new tools for the assessment, rehabilitation, and treatment of psychiatric and neurological conditions.

About the tech

  • Captures gaze, pupil and eye openness data

  • Our patented 3D eye model delivers high-quality gaze and pupil data

  • Two eye tracking cameras, taking up to 250 images per second

  • Bright and dark pupil illumination modes automatically selected for best performance

  • Fully embedded processing

  • Easy USB or USB-C connectivity

  • Simple screen attachment

  • Compatible with all main operating systems

  • Accurate software synchronization options with a wide range of external devices, such as EEG, ECG or GSR


Data you can trust

  • Works across the population regardless of age, ethnicity, or corrective lenses

  • Maintains tracking robustness in different lighting environments

  • Keeps high performance through natural head movements

  • Powerful yet portable behavioral research solution


Transparent product quality methods

Tobii Pro Fusion's high data quality has been confirmed through extensive testing methods that span from systematic variations of the environmental conditions to a general assessment of the eye tracker performance with a large population of individuals.

Find out more about our quality work
  • Our study participants are people with Autism Spectrum disorders or Schizophrenia where having an eye tracking system that is unobtrusive and allows for head movement is imperative. The dual eye tracking cameras, sampling rate and discreet design with Tobii Pro Fusion will open up the possibilities for more extensive research on our demographic.

    Dr. J. Adam Noah


    Yale University School of Medicine logo


Technical Specification

For definitions of the terms used in the tables below, see the Glossary on Tobii Connect.

For more information about output data and the supplementary data stream, please read the Tobii Pro SDK documentation.

The characteristics of the gaze data from an eye tracker are described in terms of accuracy and precision. For more details, take the Accuracy and precision course in Tobii Academy.

Eye tracking technique

Video-based pupil and corneal reflection eye tracking with dark and bright pupil illumination modes.

Dark pupil tracking is supported in all sample frequencies. Bright pupil tracking is supported at 60 and 120 Hz.

Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.

Eye tracking mode

N/A (default)

Sampling frequency

30 Hz, 60 Hz, 120 Hz, or 250 Hz (max. frequency depends on hardware version)


0.04° RMS¹ in optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.2° RMS¹ in optimal conditions (raw signal)


0.3°¹ in optimal conditions

Binocular eye tracking


Eye tracker latency

Mean latency < 13 ms @ 250 Hz (SD < 1.2 ms)² 

Blink recovery time

1 frame (immediate) 

Gaze recovery time

250 ms

Data sample output

Gaze origin 
Gaze point 
Pupil diameter 

Eye openness data stream

Eye openness stream is available in eye tracker set to 120 Hz, 60 Hz, and 30 Hz sampling frequencies. Note that the eye openness signal is not available in 250 Hz due to the processing power limitation. Eye openness stream has the same frequency as the gaze stream and will have the same timestamps. Eye openness data is provided in millimeters for each eye individually.

Eye image data stream

Eye image data stream frequency is approximately 4 Hz (one image per eye). Zoomed-in eye images available in tracking mode. Full-frame camera images are available in gaze recovery mode.

TTL input stream

Not available

Tracker and client time synchronization

Integrated between the eye tracker time domain and the client computer time domain.

User calibration

Binocular, Monocular

¹Tobii uses an extensive test method to measure and report performance and quality of data. Please download the test report for more detailed information.²Visit Tobii Connect for more information on how to optimize your Tobii Pro Fusion setup.

Head movement tolerance

Dual-camera system, with more images than a one camera system, gives a more accurate data calculation and the best level of precision and robustness for head movement.

Operating distance (mounted on screen)

50 cm to 80 cm (20” to 31”) from the eye tracker

Freedom of head movement (width x height)

Freedom of head movement at 65cm distance 40 cm × 25 cm (15.7" × 9.84")

Freedom of head movement at 80cm distance 45 cm x 30 cm (17.7" x 11.8")

Optimal screen size

Up to 24" (16:9 aspect ratio)

Recommended monitor


Tracker setup options

Eye tracker mounted on a tripod, allows for even larger screens or physical objects to be tracked.

Software and framework compatibility

Tobii Pro Lab Tobii Pro Eye Tracker Manager Tobii Pro SDK Any application built on the Tobii Pro SDK

Operating systems

Windows, macOS, Linux

Hardware versions

60Hz 120Hz 250Hz

Dimensions (L x H x W)

37.4 cm × 1.8 cm × 1.37 cm (14.72“ × 0.70“ × 0.53“)


168 g (5.9 oz.)


USB Type-C (USB Type-A to Type-C adapter provided) AC power

Data Processing

3 Tobii EyeChip™ ASIC with fully embedded data processing

Eye tracking cameras

2 x Tobii EyeSensor™ modules


Dark pupil illumination modules
Bright pupil illumination modules 

Power consumption

Typical power consumption: 4.3 W Max. rated power consumption: 9 W

Power options

Directly via USB Type-C connector, or with provided AC power adapter, when using a computer with USB 2.0 Type-A port

Tobii Pro SparkTobii Pro FusionTobii Pro Spectrum
Precision0.26° RMS¹ (ideal conditions) (applying Savitzky-Golay filtering, settings listed in the test report) 0.04° RMS¹ at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.2° RMS at optimal conditions (raw signal) 0.01° RMS¹ at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.06° RMS¹ at optimal conditions (raw signal)
Accuracy 0.45°¹ (ideal conditions) 0.3°¹ 0.3°¹
Head movement tolerance Good (Single Camera)Excellent (Dual camera)Excellent (Dual camera)
Optimal screen size Up to 27” (16:9 aspect ratio)Up to 24" (16:9 aspect ratio) Up to 24" (16:9 aspect ratio)
Freedom of head movement width x height @ 65cm distance (either eye) 35 x 35 cm 40 × 25 cm 34 x 26 cm
Freedom of head movement width x height @ back of headbox (either eye) 35 x 35 cm45 x 30 cm @80 42 x 26 cm @75
Operating distance (cm in Z direction) 45 to 95 cm50-80 cm 55-75 cm
Tracker setup optionsTracker mounted at tripod, allows for even larger screens and physical objects to be tracked.Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked. (a) Screen and eye tracker mounted together (b) Standalone eye tracker (c) Tracker and screen mounted on any standard VESA mount (d) Eye tracker used with external monitor
¹Tobii uses an extensive test method to measure and report performance and quality of data. Please download the Data quality test report for more detailed information.



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