Electroretinography with the RETIportReg.-System in the horse: normal findings after light- and dark adaptation. (20. Arbeitstagung DVG-Fachgruppe 'Pferdekrankheiten'.)

摘要

Electroretinography is an important part of specialised ophthalmologic diagnostics in the horse. For the integration of ERG in the ophthalmologic examination, a standard equine ERG examination protocol was developed. The RETIportReg. ERG-system of Acri.Tec AG was used to define normal findings using 6 horses with healthy eyes which underwent 3 repeated examinations for a total of 18 examinations. The normal findings were taken after light- and dark adaptation and repeatability was tested. Every examination was taken in standing horses, sedated with detomidine. 4 parameters of the electroretinogram were taken: a-wave amplitude, a-latency time, b-wave amplitude, b-latency time. No significant differences in all 4 parameters were encountered amongst the 6 horses. Repeatability was excellent and variability low. The unity of the active electrode and the LED-Stimulator is the special feature of the RETIport device. Because of the inseparable unity of the Koojiman-Electrode and the LED-Stimulator, motion artefacts rarely occurred. The method proved to be easy, safe and reliable. Therefore, electroretinography in the standing sedated horse can well be integrated in the ophthalmologic examination using the RETIport system.