Why do cats have vertical pupils?

to have sharper vision
to better see in the dark
to be more attractive
it is a useless mutation
The sharpest image is produced by round pupils, and if cats weren’t noc­tur­nal, they probably would have round pupils like us. But the vertical pupil, in com­bi­na­tion with hor­i­zon­tal eyelids, gives the cat greater and more accurate control in dif­fer­ent types of light­ing. A cat may adjust the amount of light by moving eyelids only.

Answers distribution

to have sharper vision
to better see in the dark
to be more attractive
it is a useless mutation
answers
flagUkraine
4%
86%
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8%
23
flagthe Netherlands
9%
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1%
1%
64
flagCanada
8%
84%
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7%
57
flagPoland
16%
77%
1%
3%
20477
flagUnknown
17%
77%
0%
3%
921
flagItaly
11%
77%
2%
8%
36
flagRepublic of Ireland
21%
76%
2%
0%
42
flagthe United Arab Emirates
9%
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4%
21
flagGermany
18%
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4%
213
flagSweden
21%
75%
0%
3%
28
flagNorway
15%
74%
5%
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39
flagAustralia
20%
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2%
2%
35
flagthe United Kingdom
19%
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4%
506
flagBelgium
24%
72%
0%
3%
29
flagthe United States
20%
71%
1%
4%
870
flagSouth Africa
27%
68%
0%
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22
flagFrance
26%
66%
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45
flagPakistan
23%
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38
flagIndia
22%
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3%
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380
flagthe Philippines
33%
61%
2%
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36

Gender

men77%
women80%
to have sharper vision
16%
15%
to better see in the dark
77%
80%
to be more attractive
0%
0%
it is a useless mutation
4%
3%

Language versions

question
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flag
Why do cats have vertical pupils?
1995
67%

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Illustration: epSos.de
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