An interesting aspect of<unk>  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. Example of the sharp division between the blind and intact fields (for someone with hemianopsia, rather than<unk> , in this case) In a<unk>  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, certain companies now claim to be able to induce recovery of vision after this three-month period.
Quadrantanopia
Presbyopia
Ocular dysmetria
Pseudomyopia
Heterotopia 
Tunnel vision
Cerebral polyopia
Nyctalopia