This is a partial loss of vision in both eyes in which the center vision is normal or spared.
Almost half of the visual field is lost, and it is the same half in both eyes.
A small circular area in the center of the eye, the macula, is spared from vision loss due to its bitemporal projection to the occiput.
Both the dorsal optic radiation and Meyer’s loop are lesioned in the occipital lobe. The occipital lobe is the most posterior portion of the head and are considered the visual processing center of the brain.
There is dual blood supply from the posterior cerebral artery and middle cerebral artery to the area of the visual cortex associated with macular sight. When there is an infarct of the PCA, the visual cortex becomes ischemic and loses function, except for the region supplying the macula, which remains nourished by the MCA.
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