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
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Very interesting!
reach: rather globaleyeslightphotography

Answers by country

blue-eyed people
brown-eyed people
elders
there is no difference
answers
flagAustria
83%
8%
0%
8%
12
flagUkraine
66%
8%
0%
25%
24
flagGreece
64%
14%
7%
14%
14
flagthe United Kingdom
53%
14%
2%
27%
69
flagPoland
50%
18%
1%
29%
8542
flagthe Philippines
50%
25%
8%
16%
12
flagthe United States
49%
24%
2%
23%
218
flagAustralia
45%
18%
0%
36%
22
flagRussia
44%
25%
0%
29%
27
flagGermany
43%
17%
1%
37%
67
flagCanada
43%
6%
6%
43%
16
flagIndia
25%
34%
9%
29%
87
flagUnknown
25%
37%
4%
33%
24