Publisher Summary Visual precision and sensitivity are certainly affected, and the different methods used for testing sensitivity in the normal and blind areas of the field underestimates the difference in sensitivity. Three classes of ganglion cells provide the retinal input to the visual system of primates. The Pα cells have large somata, large, radial dendritic trees, and thick axons. The Pβ cells have much smaller somata, small, grape-like dendritic trees, and thin axons. The Pγ cells (with some exceptions) have small somata as well, but only few long and sparsely branched dendrites. The death of the vast majority of projections ion neurons in both magno- and parvo-cellular portions of the dLGN causes transneuronal degeneration of the retinal ganglion cell layer. The phenomema of blindsight have most commonly been attributed to the retino-collicular pathway. The superior colliculus, like the pulvinar nucleus, loses its striate cortical input, a retino-colliculo-pulvino-extrastriate cortical projection remains, which might mediate visual functions in the absence of striate cortex. The bulk of the evidence shows that the residues of the visual system that survive striate cortical destruction and its degenerative consequences remain functional. Visual precision and sensitivity are certainly affected, and the different methods used for testing sensitivity in the normal and blind areas of the field underestimate the difference in sensitivity.