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Who should you expect to show stronger red-eye effect?

blue-eyed people

brown-eyed people

elders

there is no difference

The iris plays no role in the effect, but the blue-eyed people have relatively low melanin in the fundus as well. Therefore, they show a much stronger red-eye effect, as the light passing fundus is not absorbed by melanin. The role of melanin in red-eye effect is nicely demonstrated in case of heterochromia (one eye blue, one brown): typically, only the blue eye displays the effect.

Kantapat Rassamee

8

Michael Miller wikipedia → Red-eye effect

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