Although eye tracking handbooks have established imperative discussion on how the data should be analysed and written, there is still a dearth in the literature on data collection guidelines caused by the variety of features in different kinds of eye trackers. In this study, the researchers review the use of a wearable eye tracking apparatus with authentic materials and interview protocols. Exemplified through a preliminary study conducted on Year Six students in a primary school that investigates the internal processes of reading ESL texts, the significance and implications of using a wearable eye-tracking apparatus with a single point calibration are reported to improve the data collection guidelines. Relatedly, considerations for research procedures and instrument designs are also made in this paper.