right parietal radiation with damage specifically to Baum's loop will result in a left lower (inferior) quadrantanopsia. Visual neglect Visual neglect (also called hemispatial neglect or unilateral spatial neglect) differs from hemianopsia in that it is an attentional deficit rather than a visual one. Unlike patients with hemianopsia who actually don't see, those with visual neglect have no trouble seeing but are impaired in attending to and processing the visual information they receive. Whereas hemianopsia can be assuaged by allowing patients to move their eyes around a visual scene (ensuring that the entire scene makes it into their intact visual field), neglect cannot. Neglect can also apply to auditory or tactile stimuli and can even leave a patient unaware of one side of his or her own body. Ellis and Young (1998) showed that neglect can also affect patients' mental maps such that if they are asked to picture themselves standing in a familiar location and name the buildings around them, they will neglect to name the buildings on their impaired side but will be able to name them when asked to mentally face the opposite direction. Some patients with neglect also have hemianopsia, however the two often occur independent of one another. Management Some forms of hemianopia can be treated through repeated presentations of multisensory stimuli due to the process of multisensory integration occurring in the superior colliculus. Surgical interventions have also been shown to ameliorate certain forms of hemianopia due to counterbalancing brain lesions due to a process known as the Sprague effect. Notes References O'Neill, E., O'Connor, J., Brady, J., Reid, I., and Logan, P. Prism Therapy and Visual Rehabilitation in Homonymous Visual Field Loss. 2011 Optometry and Vision Science, Vol. 88, No 2 February 2011. Giorgi, RG., Woods, RI., Peli, E. Clinical and Laboratory Evaluation of Peripheral Prism Glasses for hemianopsia. Optometry and Vision Science 2009; 86: 492-502. External links Blindness Brain disorders Visual perception