EyeTribe is the world's first affordable eye tracker.
It enables us to get the eye movement trajectories and develop some tools with it.
Today I'll show you a demo play.
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The eyetribe sercer gives 30 fps data by default setting.
The upper limit is 60 fps. I use default value.
Every data can not return the coordinates of the point precisely.
Moreover small eye movement in a moment can be a noise.
I use Simple Moving Median to get current position for each 0.1 sec.

private Point2D getMedian() {
    Arrays.sort(xs);
    Arrays.sort(ys);

    float x = (xs[14] + xs[15]) / 2;
    float y = (ys[14] + ys[15]) / 2;

    return new Point2D(x, y);
}

In my display (1440x900), I think 9 blocks is the upper limit of detecting the eye position.