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
73%
11%
0%
14%
42
flagRepublic of Ireland
64%
0%
14%
21%
14
flagUkraine
62%
8%
1%
26%
56
flagthe United Kingdom
57%
13%
2%
25%
124
flagGreece
57%
9%
4%
28%
21
flagthe Netherlands
57%
7%
0%
35%
14
flagAustralia
55%
14%
0%
29%
34
flagPoland
52%
17%
1%
28%
10299
flagthe United States
51%
20%
2%
24%
301
flagItaly
50%
16%
0%
33%
12
flagGermany
46%
18%
3%
31%
238
flagSwitzerland
45%
12%
6%
36%
33
flagBelarus
40%
25%
10%
25%
20
flagRussia
38%
23%
1%
36%
65
flagthe Philippines
38%
23%
4%
28%
21
flagCanada
36%
16%
10%
36%
30
flagNigeria
33%
41%
16%
8%
12
flagEgypt
30%
53%
0%
7%
13
flagUnknown
25%
37%
4%
33%
24
flagIndia
20%
37%
10%
28%
173