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.

Answers distribution

blue-eyed people
brown-eyed people
elders
there is no difference
answers
flagBelgium
90%
0%
0%
10%
10
flagUkraine
81%
9%
0%
9%
11
flagRepublic of Ireland
77%
0%
0%
22%
18
flagDenmark
70%
10%
0%
20%
10
flagItaly
65%
13%
0%
21%
23
flagCanada
65%
10%
0%
25%
20
flagSweden
63%
21%
0%
15%
19
flagGermany
60%
12%
1%
25%
93
flagthe Philippines
60%
10%
10%
20%
10
flagthe United Kingdom
57%
14%
1%
27%
191
flagAustria
56%
12%
6%
25%
16
flagPoland
54%
15%
1%
27%
7709
flagthe United States
53%
20%
2%
23%
240
flagNorway
50%
28%
0%
21%
14
flagFrance
50%
21%
0%
28%
14
flagRussia
50%
20%
0%
30%
10
flagIndia
46%
16%
4%
32%
67
flagthe Netherlands
44%
3%
0%
51%
29
flagSwitzerland
40%
20%
0%
40%
10
flagUnknown
35%
24%
1%
37%
381

Gender

men48%
women62%
blue-eyed people
48%
62%
brown-eyed people
19%
14%
elders
1%
0%
there is no difference
30%
22%

Details

Author: Kantapat Rassamee
Illustration: Michael Miller
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