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
flagUkraine
65%
5%
0%
30%
20
flagthe United Kingdom
51%
12%
3%
30%
56
flagGreece
50%
20%
10%
20%
10
flagPoland
49%
18%
1%
30%
8090
flagthe United States
46%
25%
2%
24%
190
flagCanada
43%
6%
6%
43%
16
flagRussia
42%
14%
0%
42%
14
flagGermany
41%
19%
2%
36%
41
flagIndia
26%
34%
8%
29%
72
flagUnknown
25%
37%
4%
33%
24
flagAustralia
23%
30%
0%
46%
13