A nystagmograph for judging whether chronic dizziness has resulted from cerebral disease or from internal ear disease by quantitatively identifying nystagmus to cause pupils to oscillate in various directions. The nystagmograph (1) is provided with: a case (2) disposed along a visual axis connecting respective visual lines of the inspector and subject to each other; a translucent reflecting mirror (7) arranged slantwise with respect to the visual axis in the case and separating a bright place on the side of the subject from a dark one on the side of the inspector; visual means (3) of enlarging an image on an eyeball of the subject and introducing said image to the field of view of the inspector; and a window of non-reflecting coated glass (6) for guiding an image with a fixed index to the side of the subject through the translucent reflecting mirror (7). Hence, the inspector observes the movement of pupils of the subject, inspects gaze nystagmus for judging central disease while opening the smoke glass (10) of the case (2), and, with the smoke glass (10) closed, inspects non-gaze nystagmus for judging peripheral disease.
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