Light-Adapted Electroretinogram Differences in Autism Spectrum Disorder.

The team recorded light-adapted electroretinograms from the kids with ASD and 30 matched peers.

Each child sat in a dark room while a bright flash hit the eye. Sensors on the skin picked up tiny electrical waves from the retina.

They measured how big the wave was and how fast it peaked under normal room light.

Kids with ASD had smaller wave amplitudes and slower peak times than controls.

The difference was large enough that a simple eye test could flag the group with ASD.

Nothing looked wrong to the naked eye—only the machine saw the change.

Guy et al. (2016) also found vision trouble in ASD, but they used a contrast chart. The new ERG data show the problem starts at the retina, not just in the brain.

Miller et al. (2014) saw slower reaction times on visual tasks. The ERG explains part of that slowness—the eye itself sends weaker, later signals.

G et et al. (2012) meta-analysis found grey-matter changes in social brain areas. The retinal result hints these changes may extend all the way back to the eye, linking peripheral and central differences.

You now have a quick, non-verbal biomarker for ASD that takes two minutes in any optometry office. If a learner struggles with visual tasks, check basic vision first, then consider an ERG referral. The slower retinal timing also means you should give extra processing time when using visual prompts or video modeling.