The use of eye tracking technology to index visual attention has become more prevalent in sport psychology, with the quiet eye concept being a particular measure of interest. In this paper we first review (1) the definition and measurement of quiet eye, (2) its relationship with performance, (3) the proposed mechanisms underpinning the benefits of quiet eye, and (4) the utility of quiet eye training. Then we outline future research questions which will further our understanding, for example, exploring the neural mechanism of quiet eye, and testing theoretically-driven questions related to quiet eye (e.g., attentional control theory, challenge-threat cognitive appraisal theory, the strength model of self-control, etc.). We also explore how quiet eye research might be broadened to other fields; both in terms of theoretical interest (e.g., applied psychology and motor control and development), and to other areas of application (e.g., medicine, aviation, military). Quiet eye research could be applied outside of the laboratory to help athletes acquire sport skills efficiently, and maintain performance under pressure. The protocol of quiet eye research in sport could also be reference of research and application in non-sport areas; and therefore quiet eye research would be helpful in broadening research fields of psychology