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
85%
7%
0%
7%
14
flagUkraine
69%
5%
2%
23%
39
flagGreece
63%
10%
5%
21%
19
flagAustralia
60%
13%
0%
26%
30
flagthe United States
51%
22%
2%
23%
235
flagPoland
50%
17%
1%
29%
9017
flagthe United Kingdom
46%
15%
2%
33%
83
flagGermany
45%
19%
1%
34%
93
flagCanada
41%
11%
5%
41%
17
flagBelarus
41%
25%
8%
25%
12
flagthe Philippines
40%
26%
6%
26%
15
flagSwitzerland
40%
10%
0%
50%
10
flagRussia
36%
26%
2%
34%
38
flagEgypt
30%
60%
0%
0%
10
flagUnknown
25%
37%
4%
33%
24
flagIndia
23%
35%
9%
32%
100
flagPakistan
20%
30%
0%
50%
10