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Age-associated changes in the equine flash visual evoked potential.

Lena Ström1, Måns Michanek2, Björn Ekesten1

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Area of Science:

  • Veterinary Ophthalmology
  • Neuroscience
  • Equine Medicine

Background:

  • Flash visual evoked potentials (FVEPs) assess visual pathway function.
  • Age-related changes in equine visual evoked potentials are not well-documented.

Purpose of the Study:

  • To investigate age-associated changes in flash visual evoked potentials (FVEPs) in sedated horses.
  • To establish normative data for FVEPs across different age groups in horses.

Main Methods:

  • Recorded light-adapted FVEPs and electroretinograms (FERGs) in 28 healthy Standardbred horses (36 hours to 28 years).
  • Administered intravenous alpha-2-agonists for sedation, eyelid akinesia, and pupil dilation.
  • Utilized an An-vision RETIport system for data acquisition.

Main Results:

  • Reproducible FVEPs and FERGs were obtained in all horses.
  • FVEP waveform morphology was consistent across age groups.
  • Newborn foals exhibited higher FVEP amplitudes and shorter peak times compared to adult horses.
  • Adult horses showed increased P4 peak time and decreased N2P4 amplitudes with age.

Conclusions:

  • Equine FVEP waveforms are generally consistent throughout life.
  • The equine visual system is mature at birth.
  • Age-related decreases in FVEP amplitudes and increases in peak times were observed.
  • Age-matched controls are recommended for evaluating young horses; adult horses (over three years) can be compared to general adult norms.