For researchers who need the highest levels of temporal and spatial accuracy, Tobii Pro Spectrum was designed. The technology provides a median gaze accuracy of about 0.3°, with values as low as 0.16° under ideal head-supported settings, depending on the experimental arrangement. Additionally, when filtered, it reaches precision down to 0.01° RMS, which enables researchers to identify minute eye movements that are frequently impossible for traditional eye trackers to detect, such as micro-saccades, tremors, and small fixation changes.

Eye Tracking Accuracy

Depending on the experimental setup, Tobii Pro Spectrum delivers:

• Median gaze accuracy: Approximately 0.3°

• Gaze accuracy: As low as 0.16° under optimal head-supported conditions

• Precision: Down to 0.01° RMS when filtered

These performance levels enable researchers to detect:

• Micro-saccades

• Tremors

• Fine fixation changes

that are often beyond the capabilities of conventional eye trackers.

High-Speed Eye Tracking Technology

The system uses:

• Two high-speed stereo eye tracking cameras

• Video-based pupil and corneal reflection tracking

These technologies allow:

• Robust binocular eye tracking

• Continuous three-dimensional estimation of both eyes

The tracker automatically switches between:

• Bright-pupil illumination mode

• Dark-pupil illumination mode

depending on environmental conditions and participant characteristics.

This helps ensure consistent performance across:

• Different lighting conditions

• Different eye colors

• Participants wearing prescription glasses

Tobii's Patented 3D Eye Model

Another major advantage is Tobii's patented 3D eye model, which continuously estimates:

• Gaze origin

• Eye position in three-dimensional space

This significantly improves robustness against natural head movement while maintaining high data quality.

Combined with the dual-camera architecture, the tracker provides:

• Excellent head movement tolerance

• High tracking precision

allowing participants to move naturally during experiments without frequent recalibration.

Low Latency & Fast Recovery

For time-critical experiments, Tobii Pro Spectrum provides:

• Mean system latency below 2 milliseconds at 1200 Hz

• Immediate blink recovery within a single frame

• Gaze recovery in less than 150 milliseconds

These characteristics are particularly valuable for:

• Neuroscience

• Psychophysics

• Reading research

• Vision science

where precise synchronization between eye movements and rapidly changing visual stimuli is essential.

Summary

Tobii Pro Spectrum combines 0.3° median gaze accuracy, accuracy as low as 0.16°, 0.01° RMS precision, two high-speed stereo eye tracking cameras, video-based pupil and corneal reflection tracking, bright-pupil and dark-pupil illumination, Tobii's patented 3D eye model, sub-2 millisecond system latency, and rapid blink and gaze recovery to deliver exceptional eye tracking performance for advanced scientific research.

If you want to learn more about eye tracking technologies connect us on www.tidentech.com or feel free to ask us on parag@tidentech.com or tidentech@gmail.com call us on +91 9987442274.