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Composite pattern of overlapping visual field loss from all 18 patients in whom visual field defects occurred in group I. Black boxes indicate the common points missed by all 18 patients (100%) with field loss. Crossed boxes show points missed in >75% (14-17) of these eyes. Hatched boxes correspond to points missed in >50% (9-13), and centre circle boxes represent the points not seen in < 50% of eyes (<9).
