Effects of stimulus intensity for electroretinogram in conscious Miniature Schnauzers |
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Authors: | Kim Hyun-Ah Jeong Man-Bok Yi Na-Young Park Shin-Ae Kim Won-Tae Kim Se-Eun Chae Je-Min Seo Kang-Moon |
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Institution: | Department of Veterinary Surgery/Ophthalmology, College of Veterinary Medicine, Seoul National University, Gwanak-gu, Seoul, Republic of Korea. |
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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. |
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