My circa mid-1990s Timex Ironman Datalink watch had an optical sensor to receive data from your PC screen. As I recall it was pretty headache-inducing. This is pretty old-school stuff in any event. If you don't believe me, check out the Timex_Datalink entry on Wikipedia: http://en.wikipedia.org/wiki/Timex_Datalink
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My circa mid-1990s Timex Ironman Datalink watch had an optical sensor to receive data from your PC screen. As I recall it was pretty headache-inducing. This is pretty old-school stuff in any event. If you don't believe me, check out the Timex_Datalink entry on Wikipedia:
http://en.wikipedia.org/wiki/Timex_Datalink