Related Experiment Video
Updated: Jan 27, 2026

Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium
Published on: July 14, 2020
ISCEV extended protocol for the stimulus-response series for light-adapted full-field ERG
Daphne L McCulloch1, Mineo Kondo2, Ruth Hamilton3,4
1School of Optometry and Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada. daphne.mcculloch@uwaterloo.ca.
This study introduces an extended protocol for light-adapted electroretinography (LA ERG) to better assess cone system function. The new method enhances the evaluation of generalized retinal dysfunction and cone pathway responses.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- The International Society for Clinical Electrophysiology of Vision (ISCEV) provides a standard ERG protocol.
- Extended ERG testing is encouraged for comprehensive patient evaluation.
- Standard protocols may not fully characterize generalized cone system function.
Purpose of the Study:
- To describe an extended protocol for light-adapted (LA) ERG stimulus-response series.
- To characterize generalized cone system function more comprehensively.
- To aid in distinguishing on- and off-responses of the cone system and monitor ERG changes.
Main Methods:
- Recording a LA ERG stimulus-response series with increasing flash strengths.
- Utilizing a sequence of nine flash stimuli (0.03 to 300 cd s m⁻²) on a 30 cd m⁻² background.
- Presenting a shorter protocol using 5 flash stimuli to measure the "photopic hill" phenomenon.
Main Results:
- The LA ERG stimulus-response series provides a more detailed characterization of cone function than standard LA ERGs.
- LA ERG a-wave amplitudes show a saturating function, reflecting cone and cone off-bipolar cell activity.
- LA ERG b-wave amplitudes exhibit the "photopic hill" phenomenon, indicating retinal bipolar cell activity.
Conclusions:
- The extended LA ERG protocol offers a comprehensive method for evaluating generalized cone system function.
- This protocol aids in differentiating between on- and off-pathway dysfunction in the retina.
- The method allows for effective monitoring of ERG changes in retinal disorders.
More Related Videos
08:38Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
Published on: September 3, 2020
10:30Recording Light-evoked Postsynaptic Responses in Neurons in Dark-adapted, Mouse Retinal Slice Preparations Using Patch Clamp Techniques
Published on: February 11, 2015
Related Concept Videos
Photoreceptors and Plant Responses to Light
Types of Responses of Series RLC Circuits
Cells of the Adaptive Immune Response
Resistors In Series
In a series circuit, the...
Series Resonance
Trigonometric Fourier series
The trigonometric Fourier series specifically expresses a periodic function with a defined period T using sine...