In the past, this required some specialized, expensive equipment like custom glasses. But as with so many things, the increased access to laptop computers and high resolution digital cameras means that this is now within reach of many more people.
This blog post from a company that produces eye tracking software (iMotion) compiles and assesses ten free eye tracking tools. Unsurprisingly, it points out that the free stuff is more limited than the commercial stuff. Some of the links are already rotted out, but this is not a bad place to start.
Some other eye tracking options that only require webcams include:
Eye tracking might provide a way for you to do a quick internal test of whether people are looking at what you think they are looking at on your poster.
And I’m sure there are some eye tracking research waiting to be done on conference posters.
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