Quadrantanopsia

Lesions to the inferior or superior occipital lobe can result in an upper or lower visual field homonymous quadrantanopsia

The parietal lobes are concerned with the lower visual fields, whereas the temporal lobes receive massive upper visual field projection s.

An interesting aspect of quadrantanopia is that there exists a distinct and sharp border between the intact and damaged visual fields, due to an anatomical separation of the quadrants of the visual field. For example, information in the left half of visual field is processed in the right occipital lobe and information in the right half of the visual field is processed in the left occipital lobe

In a quadrantonopia that is partial, there also exists a distinct and sharp border between the intact and damaged field within the quadrant. The sufferer is able to detect light within the damaged visual field.

The prospects of recovering vision in the affected field are bleak. Occasionally, patients will spontaneously recover vision in the affected field within the first three months after the brain injury; however, vision loss remaining after this period of spontaneous recovery is traditionally thought to be permanent.