Cerebral infarction can affect vision, mainly seen in patients with occipital lobe infarction. The function of the occipital lobe is mainly related to vision, and patients with occipital lobe lesions may have visual field changes, visual hallucinations, visual disorientation, and visual distortion, among others. Visual field changes include hemianopsia, quadrantal blindness, and cortical blindness. Patients with cortical blindness may have binocular blindness with normal pupil size and light reflex. Visual hallucinations, patients may experience hallucinations, flashes of light, sparks, dark shadows and so on. Visual agnosia means that the patient is not blind, but is able to walk around obstacles, but does not recognize objects, images, colors, etc., and sometimes needs to use the sense of touch to recognize them. Visual distortion means that the objects seen by the patient become larger or smaller, irregular in shape, or change in color.