Fig. 1.

Examples of visual field deficits in patients with PCA. In P02 and P10 the deficit is limited to a hemifield, while in P03 and P04 both hemifields are affected to an extent. The shade of the box indicates the number of trials seen at each location after correction for generalised decreases in visual sensitivity with white being areas most sensitive to visual stimuli and black being locations with the greatest visual field loss.