In the head-free condition, phases with head movement were compared to phases of static head in accuracy and precision within each trial.Īverage accuracy of the eye-tracker in the head-fixed condition was 4.16°, SD: 3.23 while the precision had a mean of 2.17°, SD: 0.75. Precision was calculated as the RMS (Root Mean Square) of successive measurements. In the head-fixed condition accuracy was calculated as the mean offset between the target-eye vector and gaze-target vector. Eleven subjects were tested in the first condition ten subjects were tested in the second condition. In both conditions the displayed targets were presented in a randomized order with 5 repetitions. In the head-free condition targets were positioned in a world-fixed coordinate system, and subjects were motivated to move the gaze together with the head in a natural way towards an appearing target and fixate it. In the first condition, target position was fixed to headset, and subjects were asked to saccade to an appearing target, while keeping the head still. The current study evaluates accuracy and precision of gaze estimates over the whole visual field in head-restrained, as well as head-free conditions.Īccuracy and precision were tested at 25 sample positions spanning +- 25° horizontally and +- 25° vertically in two separate conditions: head-restrained, as well as head-free. But, many of those functions, such as gaze-contingent content presentation, require a specific level of eye tracking accuracy. Eye tracking opens up a variety of novel functions in virtual reality.
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