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正常时有三种可以代偿眼球震颤的阻断机制:1.知觉性阻断:双眼视觉可构成阻断眼球震颤的一种因素从而获得良好的双眼视力。此阻断可完全消除眼球震颤,如遮盖一眼后才出现的隐性眼球震颤;或者它能减轻显性眼球震颤,如遮盖一眼后原有眼球震颇会加剧。2.运动性阻断:眼外肌收缩使双眼稳定,眼球震颤消失。该阻断共分两型:(1)利用代偿性头位转动使双眼稳定,用左侧方固视眼位;(2)使双眼位于辐辏位置,常致近视力优于远视力。此阻断并不需要双眼视功能。眼球震颤又有斜视的患者,常与斜
Normally there are three kinds of compensatory nystagmus blocking mechanism: 1. Perceptual block: binocular vision can constitute a factor blocking the nystagmus in order to obtain good binocular vision. This block completely eliminates nystagmus, such as occult nystagmus that appears only after covering one eye; or it can reduce dominant nystagmus, which can be exacerbated by the presence of an original nystagmus if covered. 2 motor block: extraocular muscle contraction so that his eyes stable, nystagmus disappear. The block is divided into two types: (1) the use of compensatory head rotation to stabilize the eyes, with the left side fixation ocular position; (2) so that both eyes in the vergence position, often caused near vision better than far vision. This blocking does not require binocular vision. Patients with nystagmus and strabismus, often with oblique