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Updated: Sep 8, 2026
Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats
Published on: July 1, 2016
Electroretinogram and visual evoked response in a form of 'neuronal lipidosis' with diagnostic EEG features
Insights
Late infantile neuronal lipidosis in children causes severe retinal dysfunction, evidenced by non-recordable electroretinograms (ERG). However, these patients exhibit significantly enlarged cortical visual evoked responses (VER) on their electroencephalogram (EEG).
Area of Science:
- Neuroscience
- Ophthalmology
- Genetics
Background:
- Neuronal lipidosis encompasses a group of rare genetic metabolic disorders.
- Late infantile neuronal lipidosis affects the central nervous system, including visual pathways.
Purpose of the Study:
- To investigate the electrophysiological characteristics of visual pathways in children with late infantile neuronal lipidosis.
- To differentiate this condition from other neurological disorders using combined electroretinogram (ERG) and visual evoked response (VER) recordings.
Main Methods:
- Simultaneous recordings of electroencephalogram (EEG), electroretinogram (ERG), and cortical visual evoked response (VER) were performed.
- 16 children diagnosed with late infantile neuronal lipidosis were included in the study.
- ERG and VER parameters were compared to those of a control group.
Main Results:
- Electroretinograms (ERG) were typically unrecordable, indicating severe retinal receptor dysfunction.
- A markedly enlarged visual evoked response (VER) was observed in all patients, with amplitudes 12-20 times higher than controls.
- The initial components of the VER maintained similar waveform and latency to controls, despite the overall amplitude increase.
Conclusions:
- The findings suggest a specific pattern of visual pathway dysfunction in late infantile neuronal lipidosis.
- This unique combination of ERG and VER abnormalities, along with EEG findings, may serve as a diagnostic biomarker.
- The results highlight the utility of combined electrophysiological testing in understanding complex neurodegenerative disorders.
Abstract:
Combined recordings of the electroretinogram (ERG) and the cortical visual evoked response (VER) have been made together with the electroencephalogram (EEG) in 16 children suffering from a `late infantile' form of `neuronal lipidosis'. The ERG was not usually recordable, in keeping with a gross loss of function of the retinal receptor elements. However, in all the 16 children, at whatever stage of the disease, a grossly enlarged VER was seen (some 12 to 20 times higher in amplitude than in a control group) and visible as a discharge on the primary EEG tracing. The first components of the VER were, however, of fairly similar wave form and latency to those seen in the control children. This unusual combination of ERG and VER findings together with the EEG features have not been found in other groups of diseases.
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