Pro Glasses 3 Product Description v 1.4
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Appendix B
Limitations and considerations
B1
Intended 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’s Manual. Please read the User
Manual and other supplied documentation thoroughly before using the product.
B2
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 sunlight.
Shielding the eye tracker adequately from the sun may prevent sunlight from inter-
fering with eye tracking.
B3
Eyelashes
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
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.
