Vertical and horizontal bar bisection was assessed in six patients with homonymous altitudinal scotomata, four of whom had additional hemianopic scotomas. Analysis of performance showed a small but significant deviation of the bisection midline ("egocentric midline") to the upper field in four patients with blindness of the upper hemifield and a more pronounced deviation to the inferior hemifield in two patients with lower altitudinal field defects. In addition, horizontal bar bisection showed a shift of the egocentric midline towards the scotoma in all four patients with left- or right-sided homonymous hemianopia. Hence, location of the scotoma predicted direction of the shift of the egocentric midline but not degree of shift.