Electroretinography in adults with high-functioning autism spectrum disorder.
ERG shows the autistic retina works normally, so visual sensitivity likely lives in the brain, not the eye.
01Research in Context
What this study did
Researchers recorded electroretinograms from high-functioning adults with autism and matched controls. The test measures the retina's first electrical response to a flash of light. It tells us if the eye itself sends odd signals to the brain.
The team wanted to know if the retina causes the light sensitivity many autistic adults report.
What they found
The ERG waveforms looked the same in both groups. Early retinal processing appears intact. Visual hypersensitivity in autism likely starts somewhere beyond the eyeball.
In plain words, the retina is not the culprit.
How this fits with other research
Barthelemy et al. (1989) saw the same null result in the auditory path: brain-stem and mid-latency responses were normal in autistic kids. Both studies point to intact early sensory channels.
Touchette et al. (1985) used ERPs and found visual novelty processing was relatively spared while auditory processing showed clear deficits. Together the papers suggest vision is less affected at early stages than hearing.
Bhaumik et al. (2009) reviewed decades of ERP work and concluded that later cognitive stages, not peripheral receptors, drive most sensory differences in autism. The new ERG data strengthen that view for the visual system.
Why it matters
If the eye sends a clean signal, visual discomfort probably arises in the brain. You can rule out retinal problems and focus on accommodations such as tinted lenses, reduced flicker, or visual breaks. When clients report light pain, look past the retina and adjust environmental or cognitive demands instead.
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02At a glance
03Original abstract
The electroretinogram (ERG) allows the investigation of retinal signaling pathways and has increasingly been applied in individuals with mental disorders in search for potential biomarkers of neurodevelopmental disorders. Preceding ERG examinations in individuals with autism spectrum disorders (ASD) showed inconsistent results, which might be due to the small number of participants, heterogeneity of the ASD population, differences in age ranges, and stimulation methods. The aim of this study was to investigate functional retinal responses in adults with ASD by means of the light-adapted (photopic) ERG. Light-adapted ERG measurements were obtained with the RETeval® system applying three different stimulation protocols. In the final analysis, the ERG parameters a-wave, b-wave, the photopic negative response (PhNR), the photopic hill parameters as well as additional amplitude ratios were compared between 32 adults with high-functioning ASD and 31 non-autistic controls. Both groups were matched with regard to sex and age. No significant functional retinal differences in amplitude or peak time of the a- or b-wave, PhNR, the photopic hill parameters or the ERG-amplitude ratios could be detected in individuals with ASD compared to non-autistic participants. The absence of electrophysiological functional retinal alterations in ASD, suggests that changes in visual perception, such as increased attention to detail or visual hypersensitivity in ASD, are not due to impairments at early levels of retinal signal processing.
Autism research : official journal of the International Society for Autism Research, 2022 · doi:10.1002/aur.2823