Ben-David Y, Hafner H, Fradis M, Krasnitz G, Podoshin L
Department of Otorhinolaryngology-Head and Neck Surgery, Bnai Zion Medical Center, Haifa, Israel.
Am J Otol. 1996 Jan;17(1):89-92.
Electronystagmography (ENG) is generally performed with the patient's eyes closed to prevent visual fixation. In this way, direct observation of eye movements is impossible. By means of Frenzel glasses (FG), the direct observation of eye movements is possible, but the effectiveness of visual fixation suppression and the diagnostic contribution of FG must still be studied. One hundred seven patients with vertigo participated in this study. Each patient underwent a complete ENG test under two fixation modalities: (a) closed eyes and (b) open eyes with FG. The spontaneous nystagmus and the Hallpike test did not show any significant difference between the two fixation modalities. The slow-phase velocity of nystagmus with the caloric test was significantly greater with closed eyes, but the pattern of nystagmus with FG fixation was more tooth-shaped and regular than that with closed eyes. It is concluded that using FG when performing an ENG may improve its diagnostic value.
眼震电图（ENG）通常在患者闭眼的情况下进行，以防止视觉注视。通过这种方式，无法直接观察眼球运动。借助Frenzel眼镜（FG）可以直接观察眼球运动，但视觉注视抑制的效果以及FG的诊断作用仍有待研究。107例眩晕患者参与了本研究。每位患者在两种注视方式下进行了完整的ENG测试：（a）闭眼和（b）佩戴FG睁眼。两种注视方式下的自发性眼震和Hallpike试验均未显示出任何显著差异。冷热试验时闭眼时眼震的慢相速度明显更快，但FG注视时的眼震模式比闭眼时更呈齿状且更规则。结论是，在进行ENG时使用FG可能会提高其诊断价值。
