Appendix B Limitations And Considerations; B1 Intended Use; B2 Light Conditions; B3 Eyelashes - Tobii Pro Spark User Manual

Appendix B
B1 I ntended use
Tobii Pro 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 L ight conditions
We recommend that eye tracking studies be performed in a controlled environment.
Sunlight should be avoided since it contains high levels of infrared light which will inter-
fere 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 inter-
fering with eye tracking.
B3 E yelashes
Long eyelashes can be obstructive when the participant's eyes are less open, espe-
cially 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 D roopy 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.
Tobii Pro Spark User Manual v. 1.2
L imitations and considerations
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