Visual memory can be strong despite impairment from "summary" of The Mind's Eye by Oliver Sacks
In describing visual agnosias, I have often pointed out that the ability to recognize familiar faces, or objects, or scenes may be lost, while the ability to perceive, to see, remains intact. I have described patients who can draw objects they cannot recognize, who can copy a drawing without understanding what it represents. Such patients have what is called apperceptive agnosia, a loss of the ability to apprehend the visual world, which is quite different from a loss of the ability to see. Apperceptive agnosia is sometimes seen in people with severe dementia. Such patients may recognize nothing, not even their own faces in the mirror, and are often surprised or frightened by movements or changes in their environment. They may be unable to organize their visual world, to see objects as distinct from their backgrounds, or to see objects in correct perspective. They may be unable to recognize even simple shapes or forms, or to recognize the simplest objects. Apperceptive agnosia is a profound disorder, a breakdown of the most basic elements of visual perception. It is a disorder of the most essential, primitive, "low-level" aspects of vision. But even...
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