I have recently started looking into foveal vision and how it relates to screen space / UX. I dig up a lot of interesting information but I can't seem to find any information how foveal vision works for both eyes. Almost every paper / book / site I have read references to the foveal vision of an eye but it doesn't take into consideration that humans have two eyes.
People tend to use the following image as a reference, it is linked on wikipedia and it comes from some German book (unfortunately I can't speak German).
As awesome as this image is, it only relates to the left eye. Does anyone know any information that deals with both eyes? Such as the shape of the foveal vision? How do the eyes add up? etc.
The literally only thing I have been able to find so far are these images from simplifyinginterfaces.com but these seem more like promo pictures rather than a serious research.
Any ideas where should I look?