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  • Title: Spectral analysis of pendular waveforms in congenital nystagmus.
    Author: Reccia R, Roberti G, Russo P.
    Journal: Ophthalmic Res; 1989; 21(2):83-92. PubMed ID: 2734003.
    Abstract:
    We analyzed quantitatively electronystagmographic recordings of pendular waveforms via spectral analysis methods. We found (1) symmetrical pendular oscillations in orbital positions spanning a range as wide as 40 degrees, with frequencies between 2 and 8 Hz; (2) stable and small pendular oscillations in patients without a null zone and unstable and large pendular oscillations in patients with a neutral zone; (3) a non-decreasing relationship between the amplitude and the frequency of the eye oscillations, and (4) pendular components in orbital positions at the two sides of a neutral zone. It is argued that pendular nystagmus can be generated independently of normal (jerk) nystagmus in the same orbital position.
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