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眼震是估价前庭功能最可靠的方法之一。许多前庭功能试验均利用前庭动眼反射之眼震,如冷热试验及旋转试验。而视觉固定在维持平衡中占有主要地位。临床视觉固定障碍时可出现凝视眼震及急扫追踪性眼震(Saccadie Pursuit eye movements)。Demanez及Hart在闭眼、睁眼时应用冷热试验比较眼震振幅及频率来检查视觉固定,并称之为“眼球固定指数”。Alpert谓视觉固定减退与后颅窝病变关系密切。本文目的旨在证明冷热试验之视觉抑制,从而评价其临床应用价值。
Nystagmification is one of the most reliable methods of assessing vestibular function. Many vestibular function tests utilize nystagmus of the vestibular ocular reflex, such as hot and cold test and rotation test. Visual fixation plays a major role in maintaining balance. Nystagmus and Saccadie Pursuit eye movements may occur during clinical visual fixation. Demanez and Hart examined the visual fixation by comparing the amplitude and frequency of nystagmus with a hot and cold test when they closed their eyes with their eyes open. This was called “fixation index of the eyeball.” Alpert that visual fixation decreased and posterior fossa lesions are closely related. The purpose of this paper is to demonstrate the visual inhibition of hot and cold test to evaluate its clinical value.