Why do our eyes sometimes appear red in photos taken with flash?
In: Other
The back of our eyes is a bloody wall. We just don’t normally see it because it’s shadowed. This shadowed effect helps us see.
The retina at the back of our eyeball has a very good blood supply, and son is red in colour. A camera flash is bright enough to light up the retina so it shows up in the photo. This is especially a problem at night as our pupils dilate in low light, so more light gets to the back of the eye.
Red light reduction on modern cameras works by emitting a series of flashes before the main flash in order to get the pupils to contract to reduce the effect.
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