“…As such, current trends include using a camera, either grayscale/color or combined with a depth sensor, to detect objects on the scene presented in front of the user and a HCI to make decisions on what and how to manipulate these objects [13], [14], [15], [16], [17], [18]. Recent work has promoted the use of eye tracking as a HCI as demonstrated by [12], [14], [19], [20], [21], [22], [23], [24], [25], [26], and [27], albeit with significant limitations that will be further discussed in the next section.…”