a quick and dirty method is to set the eyes to point at: main camera

then go to the individual eyes and set the point at value to ~0.7.  this slightly 'unfocuses' the eyes from the camera and takes away the crosseyedness, which allows you to render a bunch of images at roughly the same distance quickly without having to fuss with turning eye dials for every shot. i assume it would also work for animation as long as the distance from the camera were kept roughly consistent.