The patient sees object images as much smaller than they are. It can be a type of perceptual syndrome, or delusion, and is mostly seen as an ocular symptom of ocular vascular disorders or central nervous system disorders. The patient has a subjective feeling of seeing things smaller. Ophthalmologic examination and cranial examination are needed to identify. Below is the introduction of the inspection program of the vision becomes small. 1, visual field defects: relatively special, if carefully made peripheral and central visual field examination, often can be found in its typical visual field changes. 2. After the edema of optic disk subsides: its boundary is still very clear, but a certain area of optic disk may be slightly pale or pale in color, sometimes it can be manifested as edema of optic disk in one eye and optic nerve atrophy in the other eye. 3. Macula: usually not damaged, so the central visual impairment is sometimes not very serious. 4. Fundus manifestations: mild optic disc edema, the border is blurred, the optic disc may have limited areas of pale color, there may be some limited flame hemorrhages around the optic disc, retinal vascular changes are not very obvious, a few retinal arterioles are slightly thin, in some monocular episodes of the patient can also be observed in the contralateral eye, although the visual function is normal, however, it may also be manifested as optic disc edema, which may be aggravated shortly afterwards, and visual function may be reduced. The edema may worsen soon afterward, and visual function may decline. 5. Funduscopic examination: the optic disk is often small, and the physiologic depression is not obvious.