Accurate eye center localisation for low-cost eye tracking

Fabian Timm from the Lübeck University Institute for Neuro and Bioinformatics demonstrate a "novel approach for accurate localisation of the eye centres (pupil) in real time. In contrast to other approaches, we neither employ any kind of machine learning nor a model scheme - we just compute dot products! Our method computes very accurate estimations and can therefore be used in real world applications such as eye (gaze) tracking." Sounds great, any ideas on gaze estimation and accuracy?