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Fig 1. Schematic drawing of the classification by visual field defect. Fibers in the anterior part of the Meyer loop correspond to the medial sector, and posterior fibers correspond to the lateral sectors of the upper quadrant visual field on the contralateral side. Because the anterior part of the Meyer loop is more likely to be injured by a temporal lobe resection, visual defects due to temporal lobe resection begin at the medial sector in cases of slight injury, with severe cases spreading into the lateral sector. Group A, no visual field defect in the upper quadrant visual field. Group B, incomplete defect in the medial sector of the upper quadrant visual field. Group C, complete defect in the medial sector and incomplete defect within the lateral sector. Group D, complete defect in both medial and lateral sectors.
