Slow cumulative eye position to quantify optokinetic afternystagmus

Timothy C Hain*, Gaurang Patel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In 30 normal subjects we computed the slow cumulative eye position (SCEP) of optokinetic afternystagmus (OKAN) that followed 60 seconds of full-field optokinetic stimulation at 60°/s. The mean SCEP was 112.8° ± 65.0°. The lower and upper fifth percentile limits for directional preponderance of the SCEP were −38.8% and 44.3%, respectively. The time constant, which we calculated by dividing the SCEP by the initial velocity, was 12.0 ± 7.4 seconds. This value is nearly identical to the time constant obtained from semilogarithmic regression of the decay of OKAN slow-phase velocity versus time. We conclude that the SCEP is a good measure of OKAN and that it reflects the substantial amount of variability and directional asymmetry observed in the optokinetic responses of normal subjects.

Original languageEnglish (US)
Pages (from-to)255-260
Number of pages6
JournalAnnals of Otology, Rhinology & Laryngology
Issue number3
StatePublished - Mar 1992


  • humans
  • optokinetic afternystagmus
  • optokinetic nystagmus

ASJC Scopus subject areas

  • Otorhinolaryngology


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