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According to The U.S. Sun, scientists said that an image of your eye can show signs of Alzheimer's and ADHD.
You can take a pupil response test to get an insight about your neurological functions but it's usually done in a clinical setting with expensive equipment. Researchers at UCSD developed a smartphone app that records a closeup of a person's eye by using a near-infrared camera, which is already on newer smartphones.
By taking a selfie with a camera, the app can calculate the pupil size to detect any diseases like Alzheimer's. Visit The U.S. Sun for more information.