saccades
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Add support for two eyes
and take advantage of the fact that it's only a saccade if it happens in both eyes. This way we may also solve the problem of consecutive samples whose velocity dances around the threshold.
Left eye: __XXX_XXXXX____
Right eye: ___XXXXX_XXX___
Saccade: __XXXXXXXXXX___
Just use an OR to combine the two saccade vectors. Smoothing the signal or the velocities may not any longer be necessary.