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 sensation of seeing things smaller. What are the eye tests needed? Below is the introduction of the examination of small vision. 1, funduscopic examination: the optic disk is small, physiological depression is not obvious cup/disk is relatively small. 2, macula: usually not damaged, so the center of the visual impairment is sometimes not very heavy. 3, funduscopic manifestations: for mild optic disc edema, the border is more blurred, optic disc may have limited color fading area, optic disc may have some limited flame hemorrhage, retinal vascular changes are not very obvious, a few retinal arteries are a little 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, may be aggravated in the short term edema, visual function. The edema may worsen shortly thereafter and visual function may decline. 4. After the edema of optic disk subsides: its boundary is still very clear, but one area of the optic disk may be slightly lighter in color or pale, and sometimes it may be manifested as edema of the optic disk of one eye and optic nerve atrophy of the other eye. 5. Visual field defect: it is quite special, if the peripheral and central visual field are carefully examined, its typical visual field changes can often be found.