Question
a.
They can be expensive and it can be difficult to distinguish deliberate gazing from accidental glancing.
b.
They require a large amount of desk space and may be awkward to use if displaced to one side by the keyboard.
c.
They can leave greasy marks on the screen and are not very accurate.
d.
They require the screen to be within about a meter of the user to enable it to be reached.
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