Eye Tracker Technical Specifications
The EyeLink 3 head and eye tracker is a completely new kind of tracker, providing high-speed (up to 1000 Hz) gaze data as well as head tracking data. See below for the technical specifications of the EyeLink 3. Get in touch with us with any questions, or request a quote. We are here to help. You can also see the technical comparison between the EyeLink 1000 Plus, EyeLink Duo, and EyeLink 3.
Sampling Rate
250/500/1000 Hz Monocular or Binocular
Eye Tracking Principle
Dark Pupil – Corneal Reflection
Pupil Detection Models
Centroid or Ellipse Fitting
Gaze Accuracy¹
0.5°
End-to-End Sample Delay²
M = 2.37 ms (SD < 0.5 ms) @ 1000 Hz;
M = 3.38 ms (SD < 1.1 ms) @ 500 Hz
Blink/Occlusion Recovery
1.0 ms @ 1000 Hz
Gaze Precision³
1000 Hz: 0.06°/0.03°/0.02° (Filter Off/Normal/High)
500 Hz: 0.05°/ 0.02°/0.01° (Filter Off/Normal/High)
Trackable Eye Rotation Range (Decoupled X/Y Rotations)
± 26° Horizontal, ± 17° Vertical in Pupil-CR Mode
± 30° Horizontal, ± 25° Vertical in Pupil-Only Mode
Gaze Tracking Range (Rectangular Area)
40° × 25° (Without Head Movements)
70° × 50° (With Head Movements)
Eye-to-Camera Distance
65 mm – 85 mm Effective Eye Distance
> 20 mm Mirror Clearance to Eyes
Fixed Focus
Eye Video Frame Rate
Configurable (1 to 500 fps)
Glasses Compatibility
Good (Glasses Dependent)
Pupil Size Resolution³
0.1% of Diameter
Head Tracking Data
NIR Marker and IMU Data Fused
Full 6DOF (Head Position: X, Y, Z; Head Rotation: Pitch, Yaw, Roll)
IMU only (Marker Free)
Head Rotation: Pitch, Yaw, Roll
Trackable Head Rotation
NIR Marker and IMU Data Fused
Pitch: ± 15°
Yaw: ± 38°
Roll: ± 50°
IMU only (Marker Free)
Unlimited
Trackable Head Position
NIR Marker and IMU Data Fused
X: ± 55 cm
Y: 76 cm from -28 to 48 cm @ 80 cm distance
Z: 30 to 120 cm for MRK3-120; 40 to 300 cm for MRK3-240
IMU only (Marker Free)
N/A
Online Eye Event Parsing
Fixation / Saccade / Blink / Fixation Update
EDF File and Link Data Types
Pixel Data: Gaze, Eye-in-Head, Head-in-Space;
Head Tracking Data: X, Y, Z (mm), Pitch, Yaw, Roll (angles);
Additional Data Types: Raw, HREF Eye Data, Pupil Size and Pupil Ellipse data, Buttons, Messages, Digital Inputs
Real-Time Operator Feedback
Eye position gaze cursor superimposed on static image or position traces with camera images and tracking status.
Specifications are preliminary and subject to change without notice.
¹ Measured with real eye fixations at multiple screen positions on a per subject basis.
² Time from physical event until first registered sample is available via Ethernet output.
Optional data filter algorithm adds one sample delay for each filtering level.
³ Measured with an artificial eye.