One of the most frustrating aspects of autism for doctors and parents is the lack of a definitive tool for diagnosing the developmental disorder in children.
Now, researchers at the University of Missouri at Columbia report some early results that point to a potential testing method involving the pupil of the eye.
Using changes in light, the researchers compared the pupil response times of children with autism to a control group of other children.
The pupils of young people who had previously been diagnosed with autism were slower to constrict when presented with a flash of light.
The test was 92.5 percent accurate in predicting which children had autism, researchers said.