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
82%
5%
0%
11%
17
flagUkraine
67%
6%
2%
23%
43
flagGreece
63%
10%
5%
21%
19
flagAustralia
60%
13%
0%
26%
30
flagthe United States
51%
22%
2%
23%
239
flagPoland
50%
17%
1%
29%
9132
flagthe United Kingdom
47%
15%
2%
33%
86
flagGermany
46%
18%
1%
32%
107
flagSwitzerland
45%
9%
0%
45%
11
flagBelarus
42%
21%
14%
21%
14
flagRussia
41%
25%
2%
31%
48
flagCanada
38%
11%
5%
44%
18
flagthe Philippines
37%
31%
6%
25%
16
flagEgypt
30%
60%
0%
0%
10
flagUnknown
25%
37%
4%
33%
24
flagIndia
24%
34%
8%
31%
112
flagPakistan
20%
30%
0%
50%
10