| 词汇 | nystagmus |
| 释义 | nystagmus noun[ C or U ] medical specializeduk /nɪˈstæɡ.məs/ us /nɪˈstæɡ.məs/ quick uncontrolled movements of the eyes: 眼球震颤 Occasionally, rapid and abnormal eye movements termed as nystagmus may be seen.有时候会见到被称为眼球震颤的快速异常的眼球运动。 A nystagmus can be caused by a number of factors that do not involve alcohol , for example tiredness.多种与酒精无关的原因，如疲倦，都可能导致眼球震颤。 There was also nystagmus and a difficulty grasping objects by the right hand. She could no longer walk and nystagmus was present in all directions of gaze. Three patients had chin-up head postures caused by a nystagmus. Eyesight, glasses & lenses accommodative afterimage age-related macular degeneration amaurosis amblyopia dispensing optician eyeglasses glaucoma lenticular limbus long-sighted long-sightedness macula macula lutea ocular oculist ophthalmology wet macular degeneration wraparounds yellow spot Examples of nystagmusnystagmus Afterwards, no directionally selective ganglion cells were recorded, and optokinetic nystagmus was abolished. With progression, some have vibration and proprioception loss, abnormal saccades, nystagmus, ophthalmoparesis, mild optic atrophy, hypertonia (usually early), hypotonia (later), and decreased deep tendon reflexes. Rotating the body to induce vertigo resulted in postrotary nystagmus and apparent visual motion, the directions of which were dependent upon head orientation during rotation. Clinically there may be a positive fistula sign, with vertigo and nystagmus induced by pressure change in the external canal or by coughing or straining. The entire sequence should be repeated until no nystagmus can be elicited. The examiner should also search for spontaneous or gaze-evoked nystagmus. On examination, typically in addition to downbeat nystagmus, lower cranial nerve palsies and both gait and limb ataxia are noted. The nystagmus appears after a brief latency (5-10 seconds), lasts about 30 seconds, and fatigues with repeated positioning. This position is maintained until the nystagmus ceases. This causes movement of the cupula and a brief paroxysm of vertigo and nystagmus. Behavioral tests for optokinetic nystagmus responses also revealed a lack of such responses in the affected eyes. Individual chicks varied in terms of the optokinetic nystagmus gain but since data could be analyzed by paired comparisons, significant differences could be detected. Binocular rivalry and monocular dominance studied with optokinetic nystagmus. The process is slowly progressive and invariably there are associated oculomotor findings (particularly spontaneous downbeat nystagmus). Motion defined by second-order characteristics does not evoke optokinectic nystagmus. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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