Rod and cone components in the dog elcctroretinogram during and after dark adaptation.

Yanase, Jun; Ogawa, Hiroyuki; Ohtsuka, H

doi:10.1292/jvms.57.877

Cited by 15 publications

(17 citation statements)

References 3 publications

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“…The former may be intensity of the light stimulus used, filter and amplifier settings, conductor characteristics of the electrodes, and position of the electrodes [23,35]. The latter may be the level of dark-adaptation [34], exposure to bright light prior to the ERG recordings [31], and level of anesthesia or sedation [11,33]. Other variables that affect ERGs are breed of dog, age and the degree of pupil dilation [1].…”

Section: Discussionmentioning

confidence: 99%

“…3c and 3d). With increasing time in the dark, there was thus an increase in amplitudes and implicit times of b-waves for the scotopic responses, which reflects the process of dark-adaptation of the retina [34]. Both ERG systems therefore could record electrical activity of the rod photoreceptors under scotopic conditions and under dim light stimulation, and monitor the process of darkadaptation.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of Two Electroretinography Systems Used in Dogs: The HMsERG and the RETIport

Jeong

Son

Park

et al. 2011

The Journal of Veterinary Medical Science

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ABSTRACT. The purpose of the study was to compare two different electroretinography (ERG) instruments used on the same animal in a laboratory setting. Retinal function in both eyes of 12 healthy miniature schnauzers was evaluated under general anesthesia. Scotopic and photopic ERGs were recorded by the HMsERG and the RETIport using the Dog Standard Protocol recommended by the European College of Veterinary Ophthalmologists (ECVO). The waveforms of the ERGs obtained by the two ERG units were similar to those described in previous studies. The 90% reference ranges using the multiple of medians (MoM) showed that the changes in ERG parameters obtained by the HMsERG unit were very similar to those of the RETIport for most ERG responses, except for a few. The results demonstrate that the two ERG systems are comparable for evaluating retinal function in dogs. Further, the results also show that it is necessary to establish ERG system-specific limits of normality in each laboratory or clinic in order to obtain a correct diagnosis, for example by using a graphical representation of the 90% reference range.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Comparison of Two Electroretinography Systems Used in Dogs: The HMsERG and the RETIport

Jeong

Son

Park

et al. 2011

The Journal of Veterinary Medical Science

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“…It reflects a cumulative response of the retinal photoreceptor cells (Schaeppi and Liverani 1977;Yanase et al 1995;Komaromy et al 1998). The b-wave is the next positive peak (Figures 1, 2, 3 and 4).…”

Section: Essence Of Ergmentioning

confidence: 99%

“…This examination is objective, non-invasive and provides information on the function of the individual retinal cell types (Gouras 1970;Aguirre 1973). An analysis of ERGs can be used to characterise vision disorders (Acland 1988;Narfstrom et al 1995;Yanase et al 1995). Flash ERG is currently used in the early diagnostics of retinal diseases (Narfstrom et al 2002;Ofri 2002;Ekesten et al 2013) and may also be useful in making decisions on cataract surgery (Ofri 2002;Ekesten et al 2013;Wilkie and Colitz 2013).…”

Section: Introductionmentioning

confidence: 99%

Electroretinography in dogs: a review

Drazek¹,

Lew²,

Lew³

et al. 2014

Vet. Med. - Czech

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Electroretinography (ERG) in the form of full-field, flash ERG is the most commonly used technique in veterinary ophthalmology for diagnosing the functioning of the outer retina. Under light stimulation spatially distributed different cell types within the retina produce time-varying electric responses. These are recorded in the form of ERG traces consisting of a series of positive and negative wavelets. The possibility of selective stimulation of individual types of retinal cells and the analysis of constituent components of ERGs are the basis for determining the source of abnormalities and diagnosis of various types of dysfunction. In many cases, the ERG allows diagnosis of hereditary retinal disorders in dogs before the appearance of behavioural and ophthalmoscopic symptoms. This review is an introduction to the electrophysiology of vision, intended for small animal practitioners, and aimed at presenting the benefits of ERG for early ophthalmic diagnostics in dogs.Keywords: ERG; ophthalmology; PRA; retina

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“…There are 2 types of light-sensitive cells (photoreceptors): cones and rods (YANASE et al, 1995;SAMUELSON, 1999), which differ from each other in their function, shape and retinal distribution (OFRI, 1999). In dogs the rods predominate over cones (CURTIS & LIGHTFOOT, 1993;MILLER & MURPHY, 1995;SAMUELSON, 1999) and act in low illumination conditions (scotopic vision) (SAMUELSON, 1999).…”

Section: Retinamentioning

confidence: 99%

The organization of flash electroretinography unit in Veterinary Medicine

Honsho

Oriá

Júnior³

et al. 2004

Cienc. Rural

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Electroretinography is the technique that allows the evaluation of changes in electrical potential that occur when the eye is stimulated by light. Such changes reflect the response of several retinal cells including photoreceptors (cones and rods). Thus it evaluates the retinal functionality RESUMO Eletrorretinografia é a técnica que possibilita observar mudanças no potencial elétrico, que ocorrem quando o olho é estimulado pela luz. Tais mudanças refletem a resposta de várias células retinianas, incluindo os fotorreceptores (cones e bastonetes). Com ela, portanto, é possível avaliar a funcionalidade da retina e diagnosticar alterações, mesmo em retinas normais à oftalmoscopia. Em face do crescente desenvolvimento da oftalmologia

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Rod and cone components in the dog elcctroretinogram during and after dark adaptation.

Cited by 15 publications

References 3 publications

Comparison of Two Electroretinography Systems Used in Dogs: The HMsERG and the RETIport

Comparison of Two Electroretinography Systems Used in Dogs: The HMsERG and the RETIport

Electroretinography in dogs: a review

The organization of flash electroretinography unit in Veterinary Medicine

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