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the claim
Human eyes reflect red in flash photographs due to vascularized retinas
the verdict
SUPPORTED
the evidence backs this
confidence 89/100

Human eyes reflect red in flash photographs due to the rich vascularization of the retina, which reflects the light back through the pupil.

Evidence for · 3
Retinal oxygen: from animals to humans.
2017 · cited by 194
Discusses retinal oxygenation and the rich vascular supply of the human retina.
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More for · 2
Imaging the Retinal Vasculature.
2021 · cited by 36
Details optical and structural measurements of the ocular and retinal vasculature.
On the physiological processes underlying optoretinography [Invited].
2025 · cited by 2
Examines physiological processes and light-evoked changes in the retina and its vascularized layers.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8901 Aug 2026
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