An apparatus for use in visual training of a subject, the apparatus including an at least partially opaque elongate occluder for at least partially occluding a substantially laterally oriented area of a field of view of a first eye so as to define an occluded area and a non-occluded area, and, wherein in use the occluded area moves relative to the field of view, and the subject views: at least one target that extends into the occluded area using both eyes so that the subject perceives an image of the target, the image in the non-occluded area being at least partially based on signals from the first eye and the image in the occluded area being at least partially based on signals from a second eye; and, ensures the target is at least partially aligned in the occluded and non-occluded areas.