This is how you position me for optimal eye control operation:
I lie in the most relaxed position for me, on my back, neck 100% straight and only turned to the right (not bent down, that only happens when watching TV and lying on my side!).
The bed is raised a little. I have also raised the legs most of the time.
The arms are parallel to the body, but not on the body. The gaze goes to the right window (not to the balcony door, that was while sleeping!).
You roll the stand with the Surface directly into my field of vision. Because my head never stays quite where you put it, and because it is extremely tiring for the eyes to look upwards in the long run, the screen is placed on the imaginary connecting line between my eyes and the middle window of the living room.
Rotate the stand clockwise or anticlockwise as described above until the two eyes in the tracking status are in the correct position. Then move the stand forward or backward until the small triangle takes the correct position in the preview, as also described at the beginning.
Now I start the calibration.
This takes half a minute, during which I have to look very intently at the screen. My gaze must not lose sight of the moving circle on the screen, otherwise I have to start all over again. Please wait with me until I have finished. Sometimes you have to position the stand better.
If we have done everything correctly, the result looks like nine green circles on the screen, each with two lines as short as possible inside.