The brain is unable to process the visual information sent to it from the eyes through the visual pathways.

The brain's inability to process the visual formation sent to it from the eyes through the visual pathways.

A temporary or permanent visual impairment caused by the disturbance of the posterior visual pathways and/or the occipital lobes of the brain. The degree of vision impairment can range from severe visual impairment to total blindness. The degree of neurological damage and visual impairment depends upon the time of onset, as well as the location and intensity of the insult. It is a condition that indicates that the visual systems of the brain do not consistently understand or interpret what the eyes see.