The electroretinogram (ERG) is a useful tool for objective, non-invasive assessment of retinal function both in the clinic and the laboratory. It is a mass electrical potential that represents the summed response of all the cells in the retina to a change in illumination. Recordings can be made in vivo under physiological or nearly physiological conditions using electrodes placed on the corneal...

Contrast thresholds for the pattern electroretinogram (PERG) were measured using lock-in amplifier retrieval of the retinal signal and a swept contrast display. Contrast sensitivity functions (CSF) developed from these PERG contrast thresholds were compared with those established psychophysically under identical stimulus conditions. Whereas the PERG CSF showed a band-pass characteristic across ...

The electroretinogram (ERG) has been a traditional tool for the measurement and the analysis of spectral sensitivity. With the appropriate choices of stimulus and measurement conditions, the ERG permits a noninvasive examination of photopigment complement and provides the means for studying the combination of spectral signals at various locations throughout the retina. There are a number of pra...

Dear Editor We appreciate the comments by Gundogan et al. [1] on our paper entitled ‘Multifocal electroretinograms in Stargardt’s disease/fundus flavimaculatus’, published in Ophthalmologica [2] . They asked us to present more details on the full-field electroretinograms (ERGs) and also to calculate the correlation between the visual amplitudes of the multifocal ERGs’ central response, the visu...

The pattern electroretinogram has been found to be abnormal in all except three cases of maculopathy. This is in contrast to other electrophysiological tests, which are frequently unaffected. The degree of reduction is related to the loss of visual acuity. The response to focal flashes is less affected than the response to pattern.