Summary

One such eye-tracking device is Pupil Labs' Core (https://pupil-labs.com/products/core). It features a camera that captures eye movements, but there's an issue where the distance between the camera and the eye is insufficient, preventing adequate eye tracking. This problem is particularly noticeable when used by people with shallow eye sockets, such as Asians (I am Japanese). This is a part designed to extend the mounting position of the eye camera.