LAUSR

A disorder of higher visual function should be considered when visual complaints are out of proportion to examination findings. Such disorders can remain undiagnosed until other cognitive deficits develop. In this chapter, we begin by reviewing the various disorders of higher visual function, which include visual agnosias, simultanagnosia, ocular motor apraxia, and optic ataxia. We next discuss practical strategies to detect these disorders. We then discuss common causes of these disorders and their diagnostic evaluation. We focus our discussion on the clinical features and imaging findings in the visual variant of Alzheimer disease, where the parieto-occipital lobes are preferentially affected in the early stages of the disease.