System Specifications; Operational / Functional Specifications - SR Research EyeLink Portable Duo User Manual

1.3 System Specifications

1.3.1 Operational / Functional Specifications

1
Average Accuracy
Sampling rate
End-to-End Sample Delay
Blink/Occlusion Recovery
Spatial Resolution
3
Noise with Participants
Eye Tracking Principle
Pupil Detection Models
Pupil Size Resolution
4
Gaze Tracking Range
Allowed Head Movements
Without Accuracy Reduction
Optimal Camera-Eye Distance
Glasses Compatibility
On-line Event Parsing
EDF File and Link Data Types
Real-Time Operator Feedback
Specifications are preliminary and subject to change without notice.
Measured with real eye fixations at multiple screen positions on a per subject basis.
1
Time from physical event until first registered sample is available via Ethernet or Analog output. Optional
2
data filter algorithm adds one sample delay for each filtering level.
Measured with an artificial eye.
3
Measured with real subject fixations.
4
Head-stabilized Mode
Down to 0.15° (0.25° to 0.5° typical)
Monocular: 250,500,1000,2000 Hz
Binocular: 250,500,1000,2000 Hz
1000 Hz: M=1.88 ms SD=0.36 ms
2
2000 Hz: M=1.34 ms SD=0.18 ms
1.0 ms @ 1000 Hz
0.5 ms @ 2000 Hz
Filter (Off/Normal/High):
1000 Hz: 0.03°/0.02°/0.01°
4
2000 Hz: 0.05°/0.03°/0.02°
Centroid or Ellipse Fitting
Customizable – Default is 32 º horizontally × 25 º vertically
±25 mm horizontal or vertical
Fixation / Saccade / Blink / Fixation Update
Gaze, Raw, and HREF eye position data/ Pupil size / Online events /
Eye position gaze cursor superimposed on static image or position
traces with camera images and tracking status.
Monocular: 250,500,1000 Hz
Binocular: 250,500,1000 Hz
1000 Hz: M=2.10 ms SD=0.37 ms
0.01°
Dark Pupil - Corneal Reflection
0.1% of diameter
42 - 62 cm
Excellent
Buttons / Messages / Digital inputs
© 2016-2017 SR Research Ltd.
Remote Mode
(Head free-to-move)
0.25-0.5° typical
500 Hz: M=3.21 ms SD=0.61 ms
2.0 ms @ 500 Hz
1.0 ms @ 1000 Hz
Filter (Off/Normal/High):
500 Hz: 0.03°/0.02°/0.01°
1000 Hz: 0.05°/0.03°/0.01°
Ellipse Fitting
20 cm × 20 cm at 52 cm
Introduction 7