Oblique orientation discrimination thresholds are superior in those with a high level of autistic traits.

Ninety-four college students with no autism diagnosis took a 30-minute computer test. They had to pick which of two striped patches was tilted more from vertical.

Each person also filled out the Autism-Spectrum Quotient, a self-report checklist of autistic traits. The team then looked for links between test scores and trait levels.

People who scored high on autistic traits did better on the hardest tilt angles. Their threshold for telling two oblique stripes apart was about a large share lower.

The relationship held across the whole range of scores. Even small increases in traits predicted slightly sharper vision for fine orientation.

Kemner et al. (2008) saw the same edge in diagnosed adults. Their PDD group found hidden objects faster while making fewer eye movements, pointing to cleaner early vision.

Lim et al. (2016) looked at brain waves and seemed to disagree. Their ASD group had smaller early P100 responses to simple patterns, hinting at weaker input. The difference is method: passive brain response versus active choice. Smaller P100 may still feed into better discrimination when the person pays attention.

Peñuelas-Calvo et al. (2019) add a warning. Their meta-analysis shows social-perception tests like the Eyes Test tap different skills in ASD and controls. Fine vision may be intact or even superior, yet social use of that input can lag.

If you test visual skills, expect some clients to outshine typical adults on angle or search tasks. Good scores do not rule out autism; they can be part of it. Use this strength when teaching visual discrimination skills like letter or part-to-whole matching. Pair sharp eyes with clear prompts and skip busy backgrounds that may overwhelm even good discriminators.