A lot of pastors are convinced that people are so dependent on visual input that we can no longer communicate effectively without it.

You know we are always appreciative of your visual input.

As humans, we have the ability to see with the mind's eye - to have a perceptual experience in the absence of visual input.

These neurons are actually firing in response to the lower level features of visual input, possibly the edges of a picture frame.

Visual input from the macula occupies a substantial portion of the brain's visual capacity.