PERIODIC ALTERNATING NYSTAGMUS
\pˌi͡əɹɪˈɒdɪk ˈɔːltənˌe͡ɪtɪŋ nˈɪstaɡməs], \pˌiəɹɪˈɒdɪk ˈɔːltənˌeɪtɪŋ nˈɪstaɡməs], \p_ˌiə_ɹ_ɪ__ˈɒ_d_ɪ_k ˈɔː_l_t_ə_n_ˌeɪ_t_ɪ_ŋ 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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