Ｖｅｒｔｉｃａｌ　Ｏｃｕｌａｒ　Ｄｙｓｍｅｔｒｉａ（Ｖｅｒｔｉｃａｌ　Ｒｅｂｏｕｎｄ　Ｎｙｓｔａｇｍｕｓ）とＯｐｔｏｋｉｎｅｔｉｃ　Ｖｅｒｔｉｃａｌ　Ｏｃｕｌａｒ　Ｄｙｓｍｅｔｒｉａについて

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タイトル別名
  • Vertical Ocular Dysmetria. Vertical Rebound Nystagmus and Optokinetic Vertical Ocular Dysmetria
  • Vertical Ocular Dysmetria Vertical Rebo

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説明

1) Ocular dysmetria were observed and recorded on electronystagmograms in one hundred cases of posterior fossa lesion especially in the midbrain and cerebellum. These are observed and recorded in vertical spontaneous ocular movement and vertical ocular movement which are induced by vertical optokinetic stimulation.<br>2) Ocular dysmetria which appear in the movements of the eyeballs in returning to the midpoint from the position of upward or downward gaze, is regarded as vertical rebound nystagmus. This phenomenon is more frequently observed in the movement returning to the midpoint from the upward gaze position than that of the downward gaze position.<br>3) Optokinetic vertical ocular dysmetria are recorded in 93 cases, and more frequently induced by the stimulation to the downward direction than upward.<br>4) The patterns of optokinetic vertical ocular dysmetria are classified into the next four types.<br>a) the dysrhythmic type which is characterized by the disorder of the rhythm of fast phase and slow phase.<br>b) the overshoot type which is characterized and originated by the overshoot of the fast phase of nystagmus.<br>c) the ataxic type which is characterized by an ataxic ocular movement originated by the disappearance of the distinction between the fast phase and the slow phase.<br>d) the saccadic (semi-inversive) type which is characterized by the disturbance of the smooth slow phase.<br>5) The neuronal system of vertical and horizontal ocular dysmetria is different. The former usually appear in the case of lesions of the cerebellum and its afferent system, and the latter usually appear in those of the cerebellum and its efferent one.

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