Participant Setup In Remote Head-Free-To-Move Mode; Figure 3-3: Focusing The Camera Image - SR Research EyeLink Portable Duo User Manual

the focus. It may only require 1 or 2 millimetres of motion to reach the correct
focus position. If a turquoise (CR signal) appears near the pupil, the best focus
will minimize the size of this colored circle.
Poor Focus Good Focus

Figure 3-3: Focusing the Camera Image

At the recommended distance, the "Illuminator Power" level in the Setup screen
should be set to 100%. If the participant wears glasses, or if the thresholds are
low, you may consider moving the eye tracking unit closer to the participant.
Now proceed to section 3.3 "Setting Pupil Thresholds".

3.2.2 Participant Setup in Remote Head-Free-to-Move Mode

The Remote Mode of the EyeLink Portable Duo eye tracker is designed for
applications where a chin rest or head mount is not desirable or perhaps not
even possible (e.g., patient work, gerontology, studies on young children, etc.).
The Remote Mode provides up to 1000 Hz tracking as well as up to 1000 Hz
head distance estimation via the use of a small target sticker placed on the
participant's forehead. Sections 3.2.2.1 and 3.2.2.2 discuss setup instructions
specific for when the camera is installed on a tripod or a Laptop Mount. Section
3.2.2.3 continues with a general discussion on operating the eye tracker in the
Remote mode.
An EyeLink Portable Duo Tutorial: Running an Experiment 45
© 2016-2017 SR Research Ltd.