June 1978
Volume 17, Issue 6
Articles  |   June 1978
End-point nystagmus.
Investigative Ophthalmology & Visual Science June 1978, Vol.17, 539-544. doi:
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      L A Abel, L Parker, R B Daroff, L F Dell'Osso; End-point nystagmus.. Invest. Ophthalmol. Vis. Sci. 1978;17(6):539-544.

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      © ARVO (1962-2015); The Authors (2016-present)

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Infrared oculography was performed during sustained lateral gaze in 12 normal subjects to investigate end-point nystagmus while fixating a target light. Five failed to develop nystagmus despite deviation up to 40 degrees from 4 to 5 min. Six subjects developed nystagmus immediately or shortly after reaching the deviated position. In one, the nystagmus (0.5 degrees to 1 degree and 1.0 Hz) began with only a 20 degree deviation. In another subject, "fatigue" nystagmus developed after 1 min at 30 degrees, and at 35 degrees nystagmus began within 2 sec. One subject developed only fatigue nystagmus, which began after more than 4 min of sustained deviation. In all instances the slow phase had primarily a linear, rather than exponential, waveform.


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