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Related Experiment Videos

Visual latency in the spontaneous Pulfrich effect.

Gordon Heron1, Lynne McCulloch, Neale Dutton

  • 1Department of Vision Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 OBA, UK. ghe@gcal.ac.uk

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|August 23, 2002
PubMed
Summary

Traumatic optic neuropathy from midface injury causes visual latency differences. Pattern visual evoked potentials (VEPs) show larger delays than the spontaneous Pulfrich effect, though both correlate.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Traumatic optic neuropathy (TON) can result from midface injuries.
  • Interocular visual latency differences are a potential consequence of TON.

Purpose of the Study:

  • To compare interocular visual latency differences in patients with TON using the spontaneous Pulfrich effect and pattern visual evoked potentials (VEPs).

Main Methods:

  • Six patients with spontaneous Pulfrich effect post-midfacial injury observed a moving target; delay calculated via XY plotter.
  • Pattern-reversal VEPs recorded monocularly with artificial pupil for a 4 cycle/degree grating.
  • Interocular latency differences calculated from mean P100 peak latency for each eye; normal subjects included for comparison.

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Main Results:

  • Patient P100 delays ranged from 2.8–17.8 ms; Pulfrich delays were 0.14–1.3 ms.
  • Significant positive correlation found between VEP and Pulfrich delay measures.
  • VEP interocular differences were substantially larger than spontaneous Pulfrich effect delays.

Conclusions:

  • A technique to quantify interocular delay from spontaneous Pulfrich effect in midfacial trauma patients is presented.
  • Interocular delays from pattern-reversal VEPs align with Pulfrich effect findings in direction and severity but are larger absolutely.