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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23
flagCanada
8%
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7%
57
flagthe Netherlands
9%
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flagItaly
11%
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2%
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34
flagSweden
17%
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23
flagPoland
16%
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1%
3%
19406
flagUnknown
17%
77%
0%
3%
851
flagRepublic of Ireland
22%
75%
2%
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40
flagNorway
13%
75%
5%
5%
37
flagthe United Arab Emirates
10%
75%
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20
flagGermany
19%
74%
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4%
204
flagthe United Kingdom
19%
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5%
477
flagAustralia
21%
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3%
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33
flagBelgium
24%
72%
0%
3%
29
flagthe United States
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1%
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849
flagFrance
26%
66%
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45
flagPakistan
25%
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36
flagSouth Africa
28%
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21
flagIndia
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365
flagthe Philippines
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33

Gender

men77%
women80%
to have sharper vision
17%
15%
to better see in the dark
77%
80%
to be more attractive
0%
0%
it is a useless mutation
4%
3%

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Why do cats have vertical pupils?
1926
67%

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