I remember those times when we had to use huge discs we had to press against our foreheads to be able to determine the visual field of our eyes during biology lessons. Usually the small number of those devices causes rather a disruption than an collaborative learning atmosphere.
What about this little free software that I just found 5 minutes ago.
Take a look, there is also a German version available for download.
http://www.eyesage.org/
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