  Eye tracking (ET) is a research method that receives growing interest in
mathematics education research (MER). This paper aims to give a literature
overview, specifically focusing on the evolution of interest in this
technology, ET equipment, and analysis methods used in mathematics education.
To capture the current state, we focus on papers published in the proceedings
of PME, one of the primary conferences dedicated to MER, of the last ten years.
We identify trends in interest, methodology, and methods of analysis that are
used in the community, and discuss possible future developments.
