Using eye vergence to interact with objects in the 3-D space created by a stereoscopic display

Using a hand-controlled device to interact with objects displayed in 3-dimensional space can be difficult. The paper considers how eye-based interaction with 3D graphical environments offers a number of potential advantages as an input technique for both immersive and non-immersive virtual environments. Calculating the point of fixation in the viewing volume created by a stereoscopic display from knowledge of the angles of convergence of the user´s eyes offers the possibility of locating a point in virtual 3-dimensional space directly. This offers the prospect of reducing learning time by providing a natural means of pointing at displayed objects. The paper distinguishes between command-based and non-command-based interface styles