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.

Answers distribution

blue-eyed people
brown-eyed people
elders
there is no difference
answers
flagCanada
81%
6%
0%
12%
16
flagItaly
75%
6%
0%
18%
16
flagGermany
63%
9%
0%
26%
52
flagPoland
56%
14%
1%
26%
4367
flagthe United Kingdom
54%
14%
2%
27%
115
flagthe United States
53%
19%
2%
23%
193
flagIndia
50%
17%
5%
27%
58
flagthe Netherlands
50%
0%
0%
50%
10

Gender

men54%
women61%
blue-eyed people
54%
61%
brown-eyed people
17%
14%
elders
1%
0%
there is no difference
27%
22%

Details

Author: Kantapat Rassamee
Illustration: Michael Miller
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