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EyeLink Portable Duo |
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Eye Tracking Mode |
Head Stabilized Tracking |
Remote, Head Free-to-Move Tracking |
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Sampling Rate |
Monocular or Binocular
250, 500, 1000, 2000 Hz |
Monocular or Binocular
250, 500, 1000 Hz |
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Eye Tracking Principle |
Pupil with Corneal Reflection (CR) |
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Average Accuracy 1 |
Down to 0.15° (0.25° to 0.5° typical) |
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Saccade Event Resolution |
0.05° microsaccades |
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Spatial Resolution 2 |
0.01° |
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Noise with Participants 1 |
Filter (Off / Normal / High)
1000 Hz: 0.03°/ 0.02°/ 0.01°
2000 Hz: 0.05°/ 0.03°/ 0.02° |
Filter (Off / Normal / High)
500 Hz: 0.03°/ 0.02°/ 0.01°
1000 Hz: 0.05°/ 0.03°/ 0.01° |
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End-to-End Sample
Delay 3 |
M = 1.34 msec, SD = 0.18 msec @ 2000 Hz
M = 1.88 msec, SD = 0.36 msec @ 1000 Hz |
M = 2.10 msec, SD = 0.37 msec @ 1000 Hz
M = 3.21 msec, SD = 0.61 msec @ 500 Hz |
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Blink Recovery Time |
0.5 ms @ 2000 Hz
1.0 ms @ 1000 Hz |
1.0 ms @ 1000 Hz
2.0 ms @ 500 Hz |
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Pupil Detection
Models |
Centroid or Ellipse Fitting |
Ellipse Fitting |
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Pupil Size Resolution 1 |
0.1% of diameter |
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Gaze Tracking Range |
Customizable – Default is 32° horizontally, 25 ° vertically |
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Allowable Head Movement |
±25 mm horizontal or vertical |
20 cm horizontal X 20 cm vertical at 52 cm |
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Optimal Camera-Eye Distance |
42 - 62 cm |
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Glasses Compatibility |
Excellent |
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On-line Event Parsing |
Fixations / Saccade / Blink / Fixation Update |
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EDF File and Link Data Type |
Gaze, Raw, and HREF eye position data / Pupil size / Online events / Buttons / Messages / Digital inputs |
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Real-time Operator Feedback |
Eye position gaze cursor superimposed on static image or position traces with camera images and tracking status |
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Certifications |
IEC 60601-1 ed. 3., AAMI ES60601-1, CSA C22.2#60601-1 ed. 3.1, IEC 62366 ed. 1, ISO 15004-1, ed. 1, ISO 15004-2, IEC 62471 ed. 1, ISO 14971. ed. 2, IEC 60601-1-6 ed. 3.0, IEC 60601-1-2, ed. 4 |
