I did the Pencil Eye Sync Test on two different people: one adult female, one child female.
The adult, obviously, more clearly understood what we are trying to achieve and followed the pencil carefully as I moved it around her face. She saw only one pencil and one me for the entire test. She was able to follow the pencil as it came closer to, farther from and moved in various directions around her face.
The child, five years old, struggled a little more. She was able to follow the pencil as it moved left and right, but moved and blinked a lot when it was coming closer to her face. She saw one pencil for the majority of the test but saw two mes when the pencil was closest to her eyes. I'm not sure if this is just confusion or silliness or if there really was a perception problem.
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