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1 June 2004 Electroretinography in the Hispaniolan Amazon Parrot (Amazona ventralis)
Diane V. H. Hendrix, Michael H. Sims
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Electroretinography is a noninvasive method of evaluating retinal function, which is especially useful when evaluating patients with cataracts. This study was undertaken to characterize the normal latencies, amplitudes, and presence of oscillatory potentials in the electroretinogram of Hispaniolan Amazon parrots (Amazona ventralis). Six healthy 3-year-old parrots with clinically normal eyes were anesthetized with isoflurane. Electroretinograms were recorded in the light- and dark-adapted states with white light and in the dark-adapted state with white, red, and blue light. Oscillatory potentials were also recorded. The mean latency for the light-adapted a-wave was 11.35 (±1.54) milliseconds and for the light-adapted b-wave was 24.4 (±6.17) milliseconds. The mean amplitude of the light-adapted a-wave was 20.4 (±5.45) μV and of the light-adapted b-wave was 57.34 (±27.82) μV. The mean latency for the dark-adapted a-wave was 12.15 (±1.55) milliseconds and for the dark-adapted b-wave was 29.65 (±3.98) milliseconds. The mean amplitudes of the dark-adapted a-wave and dark-adapted b-wave were 38.61 (±13.44) μV and 129.47 (±26.12) μV, respectively. The oscillatory potentials were composed of 3 or 4 peaks. Variability in latency increased from O1 to O4, and 3 eyes did not have recordable O4. The data showed that the latencies of the a- and b-waves and the amplitudes of the dark-adapted b-waves of Amazon parrots were similar to those of dogs with normal retinas. The light-adapted a- and b-waves of the parrots had greater amplitudes than did the light-adapted a- and b-waves of dogs.

Diane V. H. Hendrix and Michael H. Sims "Electroretinography in the Hispaniolan Amazon Parrot (Amazona ventralis)," Journal of Avian Medicine and Surgery 18(2), 89-94, (1 June 2004).
Published: 1 June 2004
Amazona ventralis
Hispaniolan Amazon parrot
oscillatory potentials
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