Hemianopia
The word hemianopia means that vision to one side (left or right) is not present for both eyes - the brain only creating half of the picture. Left hemianopia means vision is absent on the left side, and right hemianopia means vision is absent on the right. Look at the picture below, while looking forward, hold your hands up like this on both sides and gradually bring them together to meet in the centre. With hemianopia, only one of your hands would be visible, only coming into view when it comes near to the centre. Many affected people don't realise that half of their vision is missing. Further reading: What is CVI? The Visual Field and Hemianopia. Lessons: 3d Visual Fields and 6a Hemianopia. If you suspect combined Hemianopia and Hemi Inattention (4), below, please also read What is CVI? Combined Hemianopia and Visual Inattention or Neglect.