Brain injury can sometimes cause distinct and specific behavioral impairments. One extremely rare condition is the inability to recognize everyday objects when seen, a disorder called visual agnosia. The occipital lobe is the visual cortical center, mainly associated with visual perception and visual memory, and damage to areas 18 and 19 causes visual agnosia. The main causes of visual agnosia are intracranial tumors, cerebrovascular disease, and cranial trauma. What are the tests for visual agnosia? 1.Blood routine, blood biochemistry, electrolytes: pay attention to the specific changes that have diagnostic value for the primary disease. 2, blood glucose, immunological items, cerebrospinal fluid examination, if abnormal, it has differential diagnostic significance. 3, CT, MRI examination. 4.Electroencephalography, fundus examination. Perceptual visual agnosia is a condition in which the patient is able to avoid obstacles when walking, but acts as if he or she is blind in many ways. The patient is unable to name the objects presented, draw them, or pick out the same object from a sample of objects. Patients cannot point out objects that the examiner informs them of, but the patient’s visual acuity and visual field are normal, and the patient can also distinguish small changes in the intensity and brightness of light sources. They are deficient in visual pattern recognition, with some patients complaining of an inability to see stationary objects that the patient can recognize from the background once these objects begin to move. Associative visual loss of recognition is when the patient cannot visually identify an object but can draw the object and also point out the object from a series of object samples, indicating normal visual perception. The recognition of pictures is more difficult than the recognition of physical objects.