Realistic eye models taking into account pupil dilation and corneal reflection

The eye is a complex organ and gaze is only one of its features. Even if the pupil's primary role is to regulate the amount of light entering the eye in response to different lighting conditions, pupil dilation/constriction may be due to top-down processes. For example, the Task-Evoked Pupillary response [1] could be elicited by spontaneous thoughts or emotions. When interacting with an avatar, the importance of avatar pupil dilation/constriction together with blink rate has been studied recently in a lie detection task. The inclusion of these eye features driven from real data increased the rate of truth/lie detection compared with the same stimuli without these eyes characteristics [2]. Another eye component is the cornea which is a transparent tissue that covers the iris. On its surface, a reflection of the world surrounding the person appears: this effect is called corneal reflection. A vast amount of observable environmental information can be recovered from the corneal reflection of a single eye [3]. Only recently, anatomically accurate eye models have been implemented that clone the video of an eye taking into account this reflection [4] but not tested embedded in an avatar interacting with humans