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
84%
7%
0%
7%
13
flagUkraine
68%
6%
0%
24%
29
flagGreece
66%
11%
5%
16%
18
flagAustralia
53%
15%
0%
30%
26
flagPoland
50%
18%
1%
29%
8745
flagthe United States
50%
23%
2%
23%
226
flagthe United Kingdom
50%
16%
2%
29%
75
flagthe Philippines
50%
25%
8%
16%
12
flagGermany
43%
19%
1%
35%
78
flagCanada
41%
11%
5%
41%
17
flagBelarus
41%
25%
8%
25%
12
flagRussia
40%
30%
0%
30%
30
flagSwitzerland
40%
10%
0%
50%
10
flagUnknown
25%
37%
4%
33%
24
flagIndia
23%
34%
8%
31%
92