ランダム視標による視運動性眼振:線条刺激との比較を中心に

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To investigate the influence of stimulation to the retina in optokinetic nystagmus (OKN), we tested optokinetic stimulation by numerous random dots pattern projected on a half hemispherical screen. As the random dot pattern is very bright in the whole visual field, the peripheral retina of the test subject is stimulated more strongly than that by stripe pattern which is generally used in clinical routine.<BR>The constant acceleration optokinetic stimulations by the random dot pattern and the stripe pattern were given to 30 normal subjects and the results were compared. The responses of OKN were analyzed by a small computer PDP11/34.<BR>In the OKN elicited by the random dot pattern (dot pattern OKN), the number of nystagmus was significantly more, the duration was shorter and amplitude was smaller than those in the OKN elicited by the stripe pattern (stripe pattern OKN). This tendency was especially significant in stimulating velocity less than 70 deg/sec and considered to be the characteristic of retinal OKN.<BR>The slow and fast phase amplitudes of the dot pattern OKN increased with the increase of stimulating velocity, i. e., slow phase velocity of OKN. On the other hand, in the stripe pattern OKN the amplitude of nystagmus was almost constant, and duration and the number of nystagmus was corresponded to those of stripes passing through the center of the stimulating visual field.<BR>These results indicate that the stripe pattern OKN reflects a saccadic eye movement when looking at the next stripe close to the center of visual field. However, the dot pattern OKN is a reflex eye movement for recovery of eye deviation by slow phase of nystagmus as vestibular nystagmus.
耳鼻咽喉科臨床学会の論文

ランダム視標による視運動性眼振:線条刺激との比較を中心に

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