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What causes red eye in photos?

Question

A friend has a glass eye and now her healthy eye always turns red in photos, but her glass eye doesn’t. Why?
Tom, Pimlico

Answer

** Definitive **
Name: Dell, Irith
Qualification: Ex-photographer
Answer: The light goes straight through the natural eye, hitting the blood vessels, making it look red. But in the plastic eye, it is viscous, so the light cannot get through it.

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