Embodiments of the invention include a method to determine a binocular alignment, the method comprising: measuring a disassociated phona of a first eye and a second eye of a patient at an apparent distance； and determining an accommodative convergence of the first eye and the second eye at the apparent distance using the measured disassociated phoria. In other embodiments, a system to determine a binocular alignment comprises a stereo display, for a projection of images for a first eye and a second eye； an accommodation optics, to modify the projection of the images according to an apparent distance； an eye tracker, to track an orientation of the first eye and the second eye； and a computer, coupled to the stereo display, the accommodation optics and the eye tracker, to manage a detennination of the binocular alignment.
