The article presents the results of a case study of visual agnosia. A rare case of multiple visual agnosia (object agnosia, prosopagnosia, dyslexia, color agonsia) of a patient with the bilateral damage of the brain is described. A set of various methods has been developed to diagnose the variety of cognitive disorders. A neuropsychological approach has been used to qualitatively analyze errors. Some particular features of visual cognitive disorder are considered from the point of view of the dynamic complementary interaction between the brain hemispheres and their functional asymmetry.