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
72%
15%
0%
12%
33
flagUkraine
64%
5%
1%
27%
51
flagRepublic of Ireland
61%
0%
15%
23%
13
flagGreece
60%
10%
5%
25%
20
flagBelgium
60%
20%
0%
10%
10
flagAustralia
59%
15%
0%
25%
32
flagthe United Kingdom
54%
13%
2%
28%
110
flagthe Netherlands
53%
7%
0%
38%
13
flagPoland
51%
17%
1%
28%
9874
flagthe United States
50%
21%
2%
24%
280
flagSwitzerland
45%
10%
5%
40%
20
flagGermany
43%
19%
2%
34%
177
flagRussia
43%
22%
1%
32%
58
flagthe Philippines
42%
26%
5%
26%
19
flagBelarus
41%
23%
11%
23%
17
flagCanada
37%
14%
11%
37%
27
flagEgypt
36%
54%
0%
0%
11
flagUnknown
25%
37%
4%
33%
24
flagPakistan
20%
30%
0%
50%
10
flagIndia
19%
37%
10%
29%
156