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
78%
5%
0%
15%
19
flagUkraine
63%
6%
2%
27%
47
flagGreece
63%
10%
5%
21%
19
flagAustralia
61%
12%
0%
25%
31
flagPoland
51%
17%
1%
29%
9320
flagthe United States
51%
22%
2%
23%
246
flagthe United Kingdom
51%
13%
2%
31%
94
flagGermany
47%
18%
1%
31%
111
flagRussia
42%
24%
2%
30%
49
flagBelarus
42%
21%
14%
21%
14
flagSwitzerland
38%
15%
0%
46%
13
flagthe Philippines
37%
31%
6%
25%
16
flagCanada
36%
10%
5%
47%
19
flagEgypt
30%
60%
0%
0%
10
flagUnknown
25%
37%
4%
33%
24
flagIndia
21%
37%
10%
28%
132
flagPakistan
20%
30%
0%
50%
10