Quadrantanopia
Quadrantanopia is like hemianopia (above) but only affects an upper or lower quarter of the vision for both eyes, as shown on the diagram below. It is possible to have hemianopia on one side and quadrantanopia on the other, leaving vision present in only one quarter of the visual field, most commonly an upper quarter. This can be easily missed as it can look like either absent vision or inconsistent vision. If identified, which is relatively straight forward to do, visual support can be targeted to ensure that the one quarter of the visual field where the child can see, is best used.

Click here for a more detailed explanation of the diagram below, with further illustrations of visual field deficits due to damage to the brain.

Further reading: Lesson 6e Quadrantanopia