> First hit on Google is Wikipedia (obviously). According to Wikipedia,
> doing this kind of thing requires quite invasive equipment. For some
> reason I thought you could just wear a head-mounted device that uses IR
> lasers to detect which way your eyeball is pointing, but no.

Just use a webcam and suitable software.  Googling "eye tracking 
software" seems to indicate it would be possible to set up "at home". 
This type of technology has been in use for many years, particularly for 
telling which products "catch your eye" whilst walking around shops.

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