Comparison of Electroretinogram Waveforms Acquired Using Monopolar ERG-Jet Electrode and Bipolar Burian-Allen Electrode

PURPOSE: To compare electroretinogram (ERG) waveforms acquired using an ERG-jet electrode and a Burian-Allen electrode. METHODS: ERGs were recorded with an ERG-jet electrode and a Burian-Allen electrode from both eyes of 29 volunteers. Three consecutive recordings were obtained with both electrodes from the left eye of another 6 volunteers. Peak-to-trough amplitudes and peak implicit times were compared between both eyes, and between the 2 types of electrodes. Interpersonal and intrapersonal variation were also compared. RESULTS: The differences in amplitude and implicit time between the right and left eyes were not influenced by the type of electrode. The amplitude of the ERG acquired using the Burian-Allen electrode, however, showed significant differences between both eyes, contrary to the amplitude acquired using the ERG-jet electrode. ERG recordings obtained using the ERG-jet electrode generally showed higher amplitude, shorter implicit time, and less interpersonal and intrapersonal variation than ERG recordings obtained using the Burian-Allen electrode. CONCLUSIONS: In this application, the ERG-jet ERG electrode appeared to be superior to the Burian-Allen electrode in terms of both usefulness and consistency.

Full-Field and Focal Macular Electroretinography in Normal Subjects using MacADIOS 411 and Maculoscope

Specific values for amplitude and implicit time may differ among laboratory due to normal variations in recording electrodes, equipment, and protocol. We presented the results of fulHield and focal macular electroretinography in normal subjects using MacADIOS 411 and Maculoscope. Full-field electroretinograms were obtained in 87 normal subjects (65 males, 22 females) and focal macular electroretinograms were recorded in 33 valunteers(18 males, 15 females) under controlled condition. Age-matched norms were given in table, and for the purpose of clinical application, range of values was given for each group.

Short-term Observation of Histological Changes on the Rabbit Retina after Endocryopexy

The aim of this study was to evaluate the histopathologic changes of the pigmented rabbit ratina after endocryopexy. We investigated the differences or similarity among endocryopexy, transscleral cryopexy and laser phocoagulation. Their ultrastructural changes were observed with light and electron microscope. The results were as follows; 1. The first day after endocryopexy, we observed rupture of the internal limiting membrane, breakdown the inner and outer retina, separation of intercellular gap junction of pigment epithelial cells, and accumulation of exudation within subretinal space. 2. In the 8th days, there are mull iplication of retinal pigment epithelial cell layer and development of basal infolding. 3. The present study suggested that effects of endocryopexy on the retina to cause chorioretinal adhesion was similar to transscleral cryopexy or laser photocoagulation However it should be operated on the premise that in requires technical skill for the purpose of clinical application.