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The Visual Brain

To understand the visual fields, we have to follow the pathways of the visual brain, introduced in the previous section.

The image enters our brains through our eyes, and the first area visited is the occipital lobes.

Tree of Vision: The Principal Functions of the Visual System and How They Are Connected, Gordon N Dutton, Vision and the Brain, AFB Press, 2015  Tree of Vision: The Principal Functions of the Visual System and How They Are Connected, Gordon N Dutton, Vision and the Brain, AFB Press, 2015

Above is the tree that was introduced at the end of the previous section. At the bottom are the eyes, the image goes through the eyes, along the visual pathways to the occipital lobes.

  The location of the occipital lobes (from Dutton GN. Cognitive vision, its disorders and differential diagnosis in adults and children: knowing where and what things are. Eye. 2003; 17: 289-304.) The location of the occipital lobes (from Dutton GN. Cognitive vision, its disorders and differential diagnosis in adults and children: knowing where and what things are. Eye. 2003; 17: 289-304.)

This diagram shows the position of the image processing unit in the occipital lobes. Here, in the occipital lobes, the image is given visual field and colour. With colour goes colour contrast and clarity (visual acuity).

Just because a person may not respond visually in part of their visual field, does not mean the visual field is absent, or has disappeared. It means that the person does not respond to certain visual stimulations in that part of their visual field, and it is worth testing further whether there is any useful vision in that area.

The use of the oval template gives a general shape that can be used to show all shapes and sizes of different types of visual field.

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At CVI Scotland we are devoted to helping people understand cerebral visual impairments, and together working towards developing the understanding of this complex condition.