<prompt> Vitamin B 12 deficiency is likely to cause -Bitemporal hemianopiaBinasal hemianopiaHeteronymous hemianopiaCentrocecal scotoma  <response>: The predominant cause of nutritional optic neuritis is thought to be deficiency of B - complex vitamins, particularly thiamin vitamin B1 and cyanocobalamin Vitamin B12. Deficiency of pyridoxin vitamin B6, niacin vitamin B3, riboflavin vitamin B2, and or folic acid also seems to play a role.Most common visual field defect is central or centrocaecal scotoma. 