Tobii Pro Fusion

Reach further with your research

A screen-based eye tracker, capturing gaze data at speeds up to 250 Hz. This powerful research system supports from fixation to saccade-based research outside of the lab.


Overcome research barriers

With sampling frequencies of up to 250 Hz, two eye tracking cameras, and two pupil tracking modes, Tobii Pro Fusion enables you to adapt and extend your data collection setup to different research populations, scenarios, and data requirements.

testing child in school with eye tracker

Collect your data where your subjects are available

The size and shape of Tobii Pro Fusion allow for a compact mobile lab without compromising on data quality and granularity. The patented Tobii eye tracking algorithms and robust subject calibration ensures reliable data across different indoor environments, making it easier to recruit participants.

testing a baby with an eye tracker

Support for different data collection scenarios

If you have a busy lab with students running different projects, it’s likely that each project will have different demands on the eye tracking setup. Tobii Pro Fusion provides a flexible solution that supports different research scenarios and study designs. The slim design integrates well with different stand-alone and laptop screens up to 24 inches in size. The eye tracker can also be mounted on tripods and coupled with a scene camera so it can be used in study setups that use real-world stimuli such as physical objects or scenes.

The sampling speed of up to 250 Hz allows you to capture data for a wide range of experimental paradigms (fixation, smooth pursuit, and saccade based). The different sampling frequencies and associated bright and dark pupil tracking modes allow you to adapt the performance to your study design and test population.*

*The illumination mode is selected automatically by the system during calibration.

researcher with eye tracker in backpack


High standards of data quality

Tobii Pro Fusion screen-based eye tracker is designed to provide high data quality and tracking robustness.

  • Tobii’s patented 3D eye model delivers high-caliber gaze data

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

  • Bright and dark pupil illuminators offer superior data regardless of eye shapes, ethnicity or age

  • Fully embedded processing and illumination control enables the system to work autonomously

  • Maintains high accuracy and precision during subjects' natural head movements

  • Captures pupil data at the same sampling rate as the gaze data

  • Maintains tracking robustness in different lighting environments

  • 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



Relevant publications — Tobii Pro Fusion

Effects of paradigm color and screen brightness on visual fatigue in light environment of night based on eye tracker and EEG acquisition equipment

Tian and colleagues (2022) studied the impact on human visual fatigue of electronic-device use in a dark environment at night. Tobii Pro Fusion was used to measure pupil dilation, and G.tec EEG to measure brain activity while participants performed tasks in a dark environment with different screen brightness levels and colors.

The role of eye tracker in teaching video-assisted thoracoscopic surgery: the differences in visual strategies between novice and expert surgeons in thoracoscopic surgery

Ji and colleagues (2022) used Tobii Pro Fusion to study the differences in fixation patterns and search strategies between novices and expert surgeons while watching an instructional video of surgery. To assess learning efficiency, some novices watched the instructional video a second time, but overlaid with eye-movement data of senior surgeons.

Impaired empathic accuracy following damage to the left hemisphere

Jospe and colleagues (2022) further investigated why strokes can lead to a decline in emotional understanding. They assessed patients with chronic damage in the left and right hemispheres. The researchers used an empathic accuracy naturalistic task together with eye tracking methods with Tobii Pro Fusion to explore patient understanding of the effect of others.


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

Not available

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.

Transparent product quality methods

Tobii Pro Fusion's high data quality has been confirmed through extensive testing. We use well-documented test 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.

Consistent reproducibility in studies is guaranteed with quality control procedures throughout the entire production process, including camera focus and the calibration of each unit. Multiple product certifications ensure that quality and user safety requirements are met.

testing in a lab setting with an eye tracker



Find out more about the product.

Fields of use

Tobii Pro Spectrum
Scientific research

Psychology and neuroscience

Making the connection between eye movements, cognitive processes, and reactions to expand scientific knowledge of human behavior.

Learn more
Child playing with puzzle pieces
Scientific research

Developmental psychology

Enabling researchers to study gaze behavior, one of the first developments, opening the door to a child's mind long before acquiring language.

Learn more
Woman looking at CT scans
Scientific research

Clinical research

Clinical researchers use eye tracking to explore biomarkers for impaired brain function, enabling new tools for diagnosis, rehabilitation, and treatment.

Learn more

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