“…There are several contributing factors to this including, blinking, contact lenses, eye lashes, a child moving their head to look at a peer all of which prevent the camera from capturing an image of the eye. However, researchers may want to measure blinks to understand the child's behaviour [54,89]. The amount of data loss can vary between studies and it has been reported at around 25% in a gaze based study to predict children's personalities when interacting with a robot [71].…”