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Researcher places infrared contacts in participant's eyes. (Yuqian Ma/Yunuo Chen/Hang Zhao via SWNS)

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Preparation procedures for infrared contacts. (Sheng Wang via SWNS)

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Study participant putting contacts in. (Yuqian Ma/Yunuo Chen/Hang Zhao via SWNS)

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Research scientists John Nees (left) and Paul Campbell work on the Zeus laser. (Szczepanski/Michigan Engineering via SWNS)

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Richard Van Camp, Laser Engineer works on the Zeus laser. (Szczepanski/Michigan Engineering via SWNS)

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A detail of the ZEUS laser. (Szczepanski/Michigan Engineering via SWNS)