Effects of Stimulus Intensity for Electroretinogram in Conscious Miniature Schnauzers

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  • KIM Hyun-Ah
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • JEONG Man-Bok
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • YI Na-Young
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • PARK Shin-Ae
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • KIM Won-Tae
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • KIM Se-Eun
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • CHAE Je-Min
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University
  • SEO Kang-Moon
    Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University

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  • Surgery: Effects of stimulus intensity for electroretinogram in conscious miniature schnauzers

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Abstract

The aim of this study was to determine the most effective light intensity for flash electroretinogram (ERG) examination in conscious dogs using ERG equipment with a contact lens electrode with a built-in LED light source. ERG was performed on the bilateral eyes of ten clinically healthy Miniature Schnauzers at 6 different intensities (0.025, 0.079, 0.25, 0.79, 2.5 and 7.9 cd·s/m2) after dark adaptation for 20 min. With the increase in stimulus intensity, the most significant increase in a and b-wave amplitudes were observed at 2.5 cd·s/m2 (p<0.05). As the intensity of light was increased, the implicit times of both waves significantly decreased. Therefore, the most effective intensity of stimulus was 2.5 cd·s/m2 in the conscious Miniature Schnauzers. This suggests that this procedure would be applicable for evaluation of retinal function in conscious dogs, especially in high-risk patients.<br>

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