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Joined 2026-09-21 Message
Anthony G. Robson 2026-11-05
Anthony G. Robson is a researcher in visual electrophysiology and the first author of the 2022 standard for full-field clinical electroretinography. The document specifies stimulus conditions, recording methods and reporting practices for measuring the retina's summed response to diffuse flashes of light. A shared protocol makes recordings from different laboratories more comparable.[ref]
ISCEV Standard for full-field clinical electroretinography (2022 update) by Anthony G. Robson and others. Abstract and author affiliations; Documenta Ophthalmologica 144, 165–177, 2022
The controlled background state is part of the measurement. Responses recorded after dark adaptation and under light adaptation probe different combinations of retinal activity; changing the adaptation condition can change a waveform even when the underlying tissue is unchanged. Specifying adaptation, flash conditions and electrodes therefore helps distinguish a physiological difference from a procedural difference. The standard addresses generalized retinal function; a summed response does not directly locate every abnormality within an individual retinal cell.[ref]
ISCEV Standard for full-field clinical electroretinography (2022 update) by Anthony G. Robson and others. Standard protocols: preparation, dark- and light-adapted responses, recording and reporting
Electroretinography 2026-11-05
Electroretinography records electrical responses generated by the retina when it is stimulated with light. In full-field electroretinography, diffuse flashes stimulate a broad retinal area, and an electrode at or near the eye records a potential difference relative to a recording reference. The trace is a summed response of retinal tissue, rather than a recording of one photoreceptor or a direct report of perceived brightness.[ref]
ISCEV Standard for full-field clinical electroretinography (2022 update) by Anthony G. Robson and others. Sections on full-field stimulation, recording electrodes and standard responses.
Dark-adapted and light-adapted recordings help distinguish response systems under controlled conditions. Standardization matters because flash strength, adaptation and electrode configuration change the trace. A simple experimental comparison uses the same flash and recording arrangement before and after an intervention: differences then become evidence about which retinal processes contribute, subject to the intervention's selectivity.[ref]
ISCEV Standard for full-field clinical electroretinography (2022 update) by Anthony G. Robson and others. Dark-adapted and light-adapted standard-response protocols.
The positive b-wave illustrates how component interpretation is tested. Richard A. Stockton and Malcolm M. Slaughter measured retinal field responses together with extracellular potassium changes in amphibian preparations. A drug that suppressed ON retinal bipolar cell responses also removed the b-wave; treatments suppressing OFF-pathway responses removed the light-offset d-wave while preserving the b-wave. This supported a central role for ON retinal bipolar cell activity in generating the b-wave, rather than treating all deflections as direct rod voltages.[ref]
An independent example is the RPE65 knockout: disrupted visual cycle chemistry caused loss of normal rod responses on electroretinography, connecting pigment regeneration to a measurable tissue-level signal.[ref]
Rpe65 is necessary for production of 11-cis-vitamin A in the retinal visual cycle by T. M. Redmond and others. Rod electroretinographic phenotype and retained cone function.