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Appendix B Limitations and Considerations
B1 Intended Use
Tobii eye trackers are intended to be used in research activities about
human behavior including eye movements, in a dry and dust free indoor
environment. The product should only be used as described in this User
Manual. Please read the User Manual and other supplied documentation
thoroughly before using the product.
B2 Light Conditions
Tobii recommends that eye tracking studies be performed in a controlled
environment. 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
sunlight.
Shielding the eye tracker adequately from the sun may prevent sunlight
from interfering with eye tracking.
B3 Eye Lashes
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.
B4 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.
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