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Pupil size can help diagnose conditions like concussion
Irina Silnikova/Getty Images
As you breathe, your pupils change size: they are smallest as you begin to inhale, gradually enlarge to their largest as you exhale, and then rapidly shrink as you finish exhaling.
“I’m not going to see it with my naked eye.” Martin Schafer “I think it’s hard to see,” said the researcher at the Karolinska Institute in Stockholm, Sweden.
We’ve known for decades that breathing affects pupil size, but the science behind it is…
Source: www.newscientist.com
