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
76%
8%
0%
16%
25
flagUkraine
64%
6%
2%
28%
50
flagGreece
63%
10%
5%
21%
19
flagRepublic of Ireland
61%
0%
15%
23%
13
flagAustralia
59%
15%
0%
25%
32
flagthe Netherlands
54%
0%
0%
45%
11
flagthe United Kingdom
52%
13%
2%
29%
104
flagPoland
51%
17%
1%
28%
9663
flagthe United States
51%
22%
2%
22%
266
flagSwitzerland
50%
11%
5%
33%
18
flagGermany
45%
19%
2%
31%
144
flagBelarus
43%
25%
12%
18%
16
flagRussia
42%
23%
1%
32%
56
flagthe Philippines
37%
31%
6%
25%
16
flagCanada
36%
16%
12%
36%
25
flagEgypt
36%
54%
0%
0%
11
flagUnknown
25%
37%
4%
33%
24
flagPakistan
20%
30%
0%
50%
10
flagIndia
19%
37%
11%
29%
154