Sharp's camera that zooms via squinting

Not sure when they might be commercializing this, but Sharp says they've built a prototype of a camera that lets you zoom just by partially closing your eyelid (this is different from eye-controlled auto-focus, which has been around for ages). How does it work? By placing a small optical sensor right below the viewfinder which measures how much of the white of your eye is visible and then adjusting accordingly (sounds like you have to squint all the way to maximum zoom before the lens will zoom out again). Apparently merely using your fingers, which are presumably already holding the camera, to hit the zoom button was enough of an annoyance for Sharp to dedicate some R&D dollars to this, but we'll take off the snarky hat for a moment (just a moment) and note that something like this could potentially be useful for the disabled and/or turn up in wearable cameras and displays.