THE IMAGE BELOW SHOWS WHAT A PERSON SUFFERING FROM DAMAGE / LESIONS TO THE MAIN OPTIC RADIATIONS WOULD SEE.
Damage to the main optic radiations along the visual pathway can cause field defects as above.These radiations lie deep in the parietal lobe, external to the trigome and the occipital horn of the lateral ventricle.
Below is the image of the visual pathway and associated lesions / field defects
The image below shows the visual cortex in more detail and again its lesions and associated field defects.
The lesions/ damage can be caused in many ways including, brain damage, brain injury, brain tumours, stroke, optic nerve disorders etc
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