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Volume 3
Optometry: Open Access
ISSN: 2476-2075
Optometry 2018
October 08-09, 2018
October 08-09, 2018 | Edinburgh, Scotland
3
rd
International Conference and Expo on
Optometry & Vision Science
The visual evoked potential as a clinical tool in the assessment and treatment of traumatic brain
injury
Robert A. Orsillo
Orsillo Vision Care & Optical, USA
Purpose:
The purpose of this investigation is to evaluate changes in brain function associated with concussion, and or post-
concussion syndrome individuals with emphasis on the vision sensory signal and thalamus lateral geniculate nucleus to
primary visual cortex, employing the visual evoked potential (VEP) test; also, to establish the influence of vision therapy on
recovery, used by the waveform properties of the VEP.
Methods:
The study was done by means of biasing the magnocellular pathways using a low Michelson contrast, temporally
modulated phase reversing checkerboard stimulus pattern and successive spatial frequencies, simultaneously measuring the
VEP. First, a base line of VEPs for the normal group was established and then the normal group results were compared to the
concussion, and or post-concussion syndrome group.
Results:
The normal control group VEP results of successive spatial frequencies, show repeatable findings, depicted by a
temporal organization of latency, represented by an upward slope. The concussion and post-concussion group results indicated
a temporal disorganization of latency of subsequent neural impulses resulting in a skewed and non-upward slope.
Conclusion:
The failure of the lateral geniculate nucleus (LGN) to successfully filter and deliver relevant signals in temporal
order to the visual cortex caused failure in synchronizing the feedforward connections to the feedback pathways consisting of
top-down information that facilitate reentrant processing, or meaningful perception. Following completion of vision therapy
the signs and symptoms of concussion or post-concussion resolved, and the visual evoked potential returned the temporal
organization of latency, represented by an upward slope.
Optom open access 2018, Volume 3
DOI: 10.4172/2476-2075-C1-009