An internuclear ophthalmoplegia with ipsilateral abduction deficit: half and half syndrome

A 16-year-old white boy was assaulted with fists and boots. In the emergency room, he was ataxic and had occipital scalp lacerations. Examination of both eyes showed that visual acuity was 20/20, with a normal pupils. Ocular motility showed mild left hypertropia and a moderate to severe exotropia in all cardinal positions of gaze (greatest in right gaze; fig 1). The near …