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What will happen if the down eye sensor does not detect an object? 

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While the eye looks down, the localization effect needs to be improved further.
ViewPointer not only allows any object to become an eye contact sensing appliance, it also allows identification of users and transmission of data to the user through the object.
Grid-EYE sensor overcomes the limitation of PIR sensor by detecting the human at stationary position.
Experimental results show that the system can detect an object with angular accuracy of better than 1 mrad, demonstrating the feasibility of the proposed compound eye system.
Open accessJournal ArticleDOI
Tom N. Cornsweet, Hewitt D. Crane 
111 Citations
The device may be used on an undrugged eye and does not interfere with normal visual tasks.
Results show that the proposed model can effectively detect eye-blinks.

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