FATIGABLE POSITIONAL NYSTAGMUS
\fˈata͡ɪɡəbə͡l pəzˈɪʃənə͡l nˈɪstaɡməs], \fˈataɪɡəbəl pəzˈɪʃənəl nˈɪstaɡməs], \f_ˈa_t_aɪ_ɡ_ə_b_əl p_ə_z_ˈɪ_ʃ_ə_n_əl n_ˈɪ_s_t_a_ɡ_m_ə_s]\
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Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)
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