Total IR Marker coverage
=Maximum AOA
Snapshot of the AOA
IR Marker coverage with 4 IR Markers
(at least 4 IR Markers have to stay within the field of view of the glasses)
Participant with Tobii glasses
Shopping shelves/research object
Maximum AOA/IR Marker coverage
There is an inherent maximum to the size of AOA size, due to the fact that 4 IR Markers always have to stay within
the field of view of the glasses IR Marker Sensor. See the illustrations below for an explanation of how the maximum
AOA can be roughly estimated, for a specific distance. When varying the distance to an AOA the Maximum AOA
will also vary, therefore always estimate the maximum AOA from the closest distance the participant will/may be
positioned during your study. By finding the maximum angles that 4 IR Markers can still be detected the maximum
AOA can be estimated. A Snapshot should never include more than the maximum AOA, as the eye tracker will not be
able to map data outside the maximum AOA size.
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