Pro Spectrum User Manual v2.1
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Appendix C
Limitations and considerations
C1
Intended use
Tobii Pro eye trackers are intended to be used in research activities about human beha-
vior including eye movements, in a dry and dust free indoor environment. The product
should only be used as described in this User’s Manual. Please read the User Manual
and other supplied documentation thoroughly before using the product.
C2
Light conditions
Tobii Pro recommends that eye tracking studies be performed in a controlled envir-
onment. Sunlight should be avoided since it contains high levels of infrared light which will
interfere with the eye tracker system. Sunlight affects eye tracking performance severely
and longer exposure can overheat the eye tracker. This eye tracker is not designed for
exposure to (direct) sunlight. Eye tracking generally does not work in strong direct sun-
light.
Shielding the eye tracker adequately from the sun may prevent sunlight from interfering
with eye tracking.
C3
Eyelashes
Long eyelashes can be obstructive when the participant’s eyes are less open, especially
if the participant is wearing mascara. In rare cases, eyelashes may completely block the
view of the participant’s pupils, making eye tracking impossible.
C4
Droopy eyelids
Droopy eyelids or otherwise obstructive eyelids can block the view of the participant’s
pupils. In rare cases, such eyelids may completely block the view of the participant’s
pupils, making eye tracking impossible.
Summary of Contents for Pro Spectrum
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