The determination of dark adaptation time using electroretinography in conscious Miniature Schnauzer dogs.
- Author:
Hyung Ah YU
1
;
Man Bok JEONG
;
Shin Ae PARK
;
Won Tae KIM
;
Se Eun KIM
;
Je Min CHAE
;
Na Young YI
;
Kang Moon SEO
Author Information
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords: dark adaptation time; electroretinography; Miniature Schnauzer dogs
- MeSH: Animals; Dark Adaptation/*physiology; Dogs/*physiology; Electroretinography/*veterinary; Male; Retina/*physiology; Time Factors
- From:Journal of Veterinary Science 2007;8(4):409-414
- CountryRepublic of Korea
- Language:English
- Abstract: The optimal dark adaptation time of electroretinograms (ERG's) performed on conscious dogs were determined using a commercially available ERG unit with a contact lens electrode and a built-in light source (LED-electrode). The ERG recordings were performed on nine healthy Miniature Schnauzer dogs. The bilateral ERG's at seven different dark adaptation times at an intensity of 2.5 cd.s/m2 was performed. Signal averaging (4 flashes of light stimuli) was adopted to reduce electrophysiologic noise. As the dark adaptation time increased, a significant increase in the mean a-wave amplitudes was observed in comparison to base-line levels up to 10 min (p > 0.05). Thereafter, no significant differences in amplitude occured over the dark adaptation time. Moreover, at this time the mean amplitude was 60.30 +/- 18.47 microV. However, no significant changes were observed for the implicit times of the a-wave. The implicit times and amplitude of the b-wave increased significantly up to 20 min of dark adaptation (p > 0.05). Beyond this time, the mean b-wave amplitudes was 132.92 +/- 17.79 microV. The results of the present study demonstrate that, the optimal dark adaptation time when performing ERG's, should be at least 20 min in conscious Miniature Schnauzer dogs.
