Gresty M, Leech J, Sanders M, Eggars H
Br J Ophthalmol. 1976 Sep;60(9):652-4. doi: 10.1136/bjo.60.9.652.
A case of spasmus nutans was studied using objective recordings of head and eye displacement in order to generate a precise description of the ocular oscillations and head nodding and to investigate their interrelationships. The ocularoscillations consisted of 11-Hz sinusoidal convergence movements. The head nodding consisted of a 3-Hz, 3 degrees peak to peak, sinusoidal oscillation in the horizontal plane. The occurrence of the nodding always abolished the ocular oscillation which was replaced by normal compensatory eye movements which assisted visual acuity. The hypothesis is made that the head nodding is not pathological; it is a learned behavioural pattern which permits the patient to nullify the pathological eye movements. In order to test this hypothesis further, objective evidence is required to determine the precise order of appearance of the abnormal head and eye movements in spasmus nutans.
对一例点头痉挛患者进行了研究，采用客观记录头部和眼球位移的方法，以精确描述眼球震颤和点头动作，并研究它们之间的相互关系。眼球震颤由11赫兹的正弦会聚运动组成。点头动作由水平面上3赫兹、峰峰值为3度的正弦振荡组成。点头动作的出现总是会消除眼球震颤，取而代之的是正常的代偿性眼球运动，这有助于提高视力。提出的假设是，点头动作并非病理性的；它是一种习得的行为模式，使患者能够消除病理性眼球运动。为了进一步验证这一假设，需要客观证据来确定点头痉挛中异常头部和眼球运动出现的精确顺序。
