Damage to the primary visual cortex, also known as V1, in the area of vision, but not to any other cortical region, eliminates visual awareness and causes chronic blindness.
left visual sphere
For instance, if the optic tract on the right is cut off, the left visual field loses vision (that is, blindness in the temporal visual field of the left eye and the nasal visual field of the right eye).
Right visual cortex lesions can result in total blindness in the left hemifield, but they typically spare foveal vision. This is likely because the cortical foveal representation is so extensive that a single lesion is unlikely to completely wipe it out.
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