Local ERG for clinical examination of eye diseases

✍ Scribed by Anzhelika M. Shamshinova

• Book ID: 104638632
• Publisher: Springer-Verlag
• Year: 1990
• Tongue: English
• Weight: 389 KB
• Volume: 76
• Category: Article
• ISSN: 0012-4486
• DOI: 10.1007/bf00140493

✦ Synopsis

We used a suction electrode with a frosted front window to record a full-field (general) ERG, and a suction electrode with a short-f0cus lens and a red-green light diode to record a local ERG. As the suction electrode moved with the eye, the stimulus struck the macula in all positions of gaze~ Our data showed that only mildly intense stimuli with an angular size of 10 to 15 ~ induced a retinal response, with a macular contribution of 70%. Patients with various dystrophic changes of the retina, such as Stargardt's dystrophy, vitelliform dystrophy of the Best type, X-linked juvenile retinoschisis, and age-related macular dystrophy of different stages, were examined. In patients with retinitis pigmentosa, the cones were involved in the pathologic process to varying degrees; the behavour of the local ERGs helped determine the final visual acuity. We also observed a reduction in the local ERG in patients with Stargardt's dystrophy that disappeared as the disease progressed. In age-related macular dystrophy, a disturbance of the electrogenesis mainly occurred il~ the central retina in advanced stages of the disease.