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
flagthe Netherlands
8%
85%
2%
0%
47
flagCanada
9%
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7%
54
flagSweden
11%
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5%
18
flagPoland
17%
76%
1%
3%
15040
flagUnknown
17%
75%
1%
5%
57
flagRepublic of Ireland
22%
74%
2%
0%
35
flagItaly
15%
73%
3%
7%
26
flagGermany
20%
72%
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5%
169
flagNorway
13%
72%
6%
6%
29
flagAustralia
20%
72%
3%
3%
29
flagthe United Arab Emirates
11%
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0%
5%
18
flagthe United States
19%
71%
1%
5%
797
flagthe United Kingdom
20%
71%
0%
5%
400
flagPakistan
24%
69%
0%
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33
flagDenmark
25%
68%
6%
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16
flagFrance
24%
67%
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37
flagIndia
24%
64%
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331
flagBelgium
31%
63%
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19
flagSouth Africa
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16
flagthe Philippines
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28

Gender

men77%
women80%
to have sharper vision
17%
16%
to better see in the dark
77%
80%
to be more attractive
0%
0%
it is a useless mutation
5%
3%

Language versions

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Why do cats have vertical pupils?
1741
67%

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Illustration: epSos.de
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