The Eye Tribe

Hi,
I am trying to develop an app for a case where the users may not be able to focus on the point to calibrate the system. In my environment I can guarantee that the eye level and distance from the tracker will be fixed (or within a very narrow range) and the position and size of the monitor will also be fixed. The variables then are eye size, color, distance between eyes, etc. Is there any way to provide alternate calibration data for such a case?

This might be a useful resource for you:

Hennessey & Lawrence 2009 Improving the accuracy and reliability of remote system-calibration-free eye-gaze tracking (http://ieeexplore.ieee.org/xpl/articleD ... er=4797862)