Why does the flash cause red eye?
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1 comment:
It's such sudden light that the refractive lens in the pupil doesn't have time to contract, as it usually would when sensing bright light. Instead, the light actually reflects off the refractive lens, causing the eyes to "glow". Red-eye reduction features on cameras flash once, pause for a fraction of second and then flash again as they take the picture. This allows the pupils to contract between the first flash and the actual picture.
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