The need for modifications to the chin rest for the stand arose during an eye-tracking analysis conducted using the Tobii Chin Rest stand. Head stabilization during eye-tracking studies is essential.
The original chin rest enforces a position where the participants' chin is aligned parallel to the floor. Additionally, its smooth surface allows adjustments in distance relative to the screen and eye-tracker, as well as rotation.
A more favorable position for efficient data collection (resulting in better calibration and a higher percentage of data gathered) is one where the participant's chin is slightly tilted downward and gently supported from the front. This positioning reduces the likelihood of the lower eyelashes, prominent cheekbones, eyeglass frames, and eyelids obstructing the cornea.
The factors mentioned above may cause differences leading to varying angles of infrared light signals emitted by the eye-tracker onto the corneas of different individuals, which could result in greater deviations between measurements and, consequently, lower data quality.
The improved version (compared to the original) features a wall that blocks the chin once it is placed on the chin rest. Additionally, it is wider and contoured to fit the shape of the human chin. The ergonomic design enhances the comfort of the participant during the study.
The final version of the chin rest was manufactured using 3D printing technology with white PLA filament of 1.75 mm diameter, using a Bamboo A1 printer. The dimensions and shape, along with visualizations (renders), are included as part of the data set.
The upgraded chin rest is attached using the original screw included in the Tobii Chin Rest kit, secured by the M5 metric thread drilled into it.
(2024-10)
