Actually rather than having to wear something that emits an IR beam, it would be better to just wear a little sticker that reflects the beam from an emitter on the screen, so the weight is considerably smaller and there would be no need for wires, batteries or anything electrical. I've seen such reflective stickers being used by people who are paralyzed. They replace the function of a mouse, and with an on-screen keyboard, they replace the keyboard. They are amazingly accurate and would be suitable for this kind of idea.
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