Your visual field is the area that you can see, a bit like a physical field, it is a measure of space.
The outer edges of your vision are called your peripheral vision
Your visual field is made up of vision from both your left and right eye.
There is a large overlap in the middle.
Look straight ahead and make a note of what you can see furthest to your right. Now cover or close your right eye, and make a note of what you can see furthest to your right. Your right peripheral vision has been slightly reduced, but you have not lost the ability to see everything on your right side because you have closed your right eye, as there is a cross over with your left eye.
Looking at the image below, the picture of the house and trees is seen by both eyes.
For the visual images to be processed, they are turned round, both vertically and horizontally.
The visual information travels to the primary visual cortex in the occipital lobes (see lesson 3b) along the visual pathways between the eyes and the brain...
From the eyes, the visual information travels through the optic nerves, the crossover at the optic chiasm, along the optic tracts to the optic radiations.
The upper part of the optic radiations on both sides serves the lower part of the visual field. They sweep through the posterior parietal lobes, over the top of the water spaces on both sides, the lateral ventricles. A lower visual field impairment affecting both eyes is often due to these optic radiations being affected in both posterior parietal lobes.
There are many different types of visual field impairments, including:
Some people may have a number of visual field impairments.
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