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

Eye tracking technique Video-based pupil- and corneal reflection eye tracking with dark and bright pupil illumination modes.¹ 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.
Sampling frequency 30, 60, 120, 250 Hz (max. frequency depends on hardware version)
Binocular eye tracking Yes
Hardware versions 60Hz 120Hz 250Hz
Blink recovery time 1 frame (immediate)
Data sample output⁴Timestamp, Gaze origin, Gaze point, Pupil diameter
TTL input stream Not available
Operating system Windows, Mac, Linux
Precision²0.04° RMS at optimal conditions³ 0.2° RMS in optimal conditions (raw signal)
Accuracy²0.3° in optimal conditions³
Monocular calibration Yes
Eye tracker latency Mean latency < 13 ms @ 250 Hz (SD < 1.2 ms)
Gaze recovery time 250 ms
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.
Tracker and client time synchronization Integrated between the eye tracker time domain and the client computer time domain.
  1. Dark pupil tracking is supported in all sample frequencies. Bright pupil tracking is supported at 60 and 120 Hz.
  2. Tobii Pro 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.
  3. Applying Savitzky-Golay filtering (settings in Tobii Pro Data quality test report)
  4. For the complete list of available data and the supplementary data stream
Head movement tolerance Excellent -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.
Freedom of head movement¹ (at 80cm distance) Width x height: 45 cm x 30 cm (17.7" x 11.8")
Tracker setup options Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked.
Freedom of head movement¹ (at 65cm distance) Width × height: 40 cm × 25 cm (15.7" × 9.84")
Operating distance (mounted on screen) 50–80 cm (19.69”–31.49”) from the eye tracker
Optimal screen size 24” (16:9 aspect ratio)
  1. Describes the region in space where the participant can move his/her head and still have at least one eye within the eye tracker’s field of view (trackbox) at the specific distance.
Software and framework compatibility Tobii Pro Lab Tobii Pro Eye Tracker Manager Tobii Pro SDK Any application built on the Tobii Pro SDK
Operating systemsWindows, Mac, Linux
Hardware versions 60Hz 120Hz 250Hz
Dimensions (L x H x W) in cm/inches 37.4 × 1.8 x 1.37 (14.72" × 0.70" × 0.53")
Connectors USB Type-C, USB Type-C to USB Type-A adapter AC power
Eye tracking cameras 2
Power consumption Typical power consumption: 4.3 W Max. rated power consumption: 9 W
Weight 168g (5.9 oz.)
Data Processing 3 Tobii EyeChip™ ASIC with fully embedded data processing
Illuminators Dark pupil Illumination Modules, Bright pupil Illumination Modules
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 NanoTobii Pro FusionTobii Pro Spectrum
Precision¹0.10° RMS at optimal conditions³0.04° RMS at optimal conditions² 0.2° RMS at optimal conditions (raw signal) 0.01° RMS at optimal conditions² 0.06° RMS at optimal conditions (raw signal)
Accuracy 0.3° 0.3° 0.3°
Head movement tolerance Good (Single Camera)Excellent (Dual camera)Excellent (Dual camera)
Optimal screen size Up to 24”⁴24” 24”
Freedom of head movement width x height @ 65cm distance (either eye) 35 x 30cm 40 × 25cm 34 x 26cm
Freedom of head movement width x height @ back of headbox (either eye) 45 x 45cm⁵ @80 45 x 30cm @80 42 x 26cm @75
Operating distance (cm in Z direction) 45 - 85cm 50-80cm 55-75cm
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
  1. Tobii 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.
  2. Applying Savitzky-Golay filtering (settings in Tobii Data quality test report)
  3. Using built in filtering.
  4. For larger screens, the limiting parameter is the quality of the gaze accuracy at the upper corners of the screen when the user sits close to the screen
  5. Cone/circular shaped

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

Are you interested in this product?

Fill out the form and one of our experts will reach out to you.

Related products

Tobii Pro Lab
Behavior research software

Tobii Pro Lab

Tobii Pro Lab, our eye tracking software supporting screen-based and wearable eye trackers. Guides the researcher through the entire research workflow.

Learn more
Tobii Pro SDK

Tobii Pro SDK

Free software development kit for building analytical applications for Tobii's screen-based research eye trackers. Multiple-platform support for several programming languages.

Learn more
Tobii Pro Eye Tracker Manager
Applications and developer kits

Tobii Pro Eye Tracker Manager

Free software to help manage your screen-based eye tracker. This application helps set up the eye tracker, assists with user calibration, and troubleshooting.

Learn more