When combined with the electroretinogram (ERG), the heterochromatic flicker photometry procedure allows an objective in vivo assessment of postreceptoral activity. Responses evoked at intermediate (approximately 12 Hz) and high (>30 Hz) temporal frequencies reflect the red-green cone opponent (possibly parvocellular) and the luminance (possibly magnocellular) responses, respectively. Previously...

PURPOSE To determine the utility of multifocal electroretinograms (mfERGs) in patients with early primary open-angle glaucoma (POAG) with unilateral visual field abnormalities. METHODS mfERGs were recorded from 24 eyes of 12 cases of early POAG (stage I for 1 eye and stage II for the other eye on the Kosaki scale). The implicit times and amplitudes of the second-order kernel summed for the wh...

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...

Over the last two decades, many attempts have been made to record electroretinograms (ERG) of human macula by several investigators. However, previous ERG responses were not informative enough, because each ERG component could not be evaluated independently. However, we have developed a new system for recording focal macular ERG where we can evaluate all ERG components. This paper reviews what ...