[Answer] 5. In a photograph, what causes red eye?

Step 1 : Introduction to the question "5. In a photograph, what causes red eye?"

...1. light from a flash reflected from the back of the eyeball 2. an unpleasant medical condition 3. a red tint from overexposure in the picture 4. a prism effect in the lens of the eye Red eye comes from the red blood vessels in the back of the eye. Some flash equipment flashes a few times before the actual picture is taken so that the iris of the subject's eye will close down, minimizing the effect.

Step 2 : Answer to the question "5. In a photograph, what causes red eye?"

light from a flash reflected from the back of the eyeball:

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