British people are not known for great eye contact, but Gav steps up his game by looking deeply into Dan's eyes... From about 2 millimeters away to find out how quickly a pupil constricts. Follow us on Instagram!
The Speed of Pupil Dilation - The Slow Mo Guys Filmed at 1000fps and 500fps with a Phantom Flex 4K
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British people are not known for great eye contact, but Gav steps up his game by looking deeply into Dan's eyes... From about 2 millimeters away to find out how quickly a pupil constricts. 
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