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
flagRepublic of Ireland
75%
0%
0%
25%
16
flagItaly
71%
9%
0%
19%
21
flagCanada
65%
10%
0%
25%
20
flagGermany
61%
11%
1%
25%
85
flagthe Philippines
60%
10%
10%
20%
10
flagthe United Kingdom
56%
14%
1%
27%
185
flagPoland
54%
15%
1%
27%
7058
flagthe United States
53%
19%
2%
23%
226
flagAustria
53%
15%
7%
23%
13
flagNorway
53%
30%
0%
15%
13
flagFrance
50%
21%
0%
28%
14
flagIndia
47%
15%
4%
32%
65
flagSweden
46%
30%
0%
23%
13
flagthe Netherlands
43%
0%
0%
56%
23
flagUnknown
36%
23%
2%
38%
347

Gender

men48%
women61%
blue-eyed people
48%
61%
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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