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%
87%
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8%
24
flagthe Netherlands
10%
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1%
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68
flagCanada
9%
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8%
62
flagUnknown
16%
78%
0%
3%
1003
flagPoland
16%
77%
1%
3%
22648
flagRepublic of Ireland
20%
77%
2%
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49
flagGermany
17%
76%
0%
4%
229
flagItaly
12%
76%
2%
7%
39
flagNorway
13%
75%
4%
4%
44
flagAustralia
18%
75%
2%
2%
37
flagthe United Kingdom
18%
73%
0%
4%
549
flagBelgium
23%
73%
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3%
30
flagthe United States
19%
71%
1%
4%
945
flagDenmark
26%
69%
4%
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23
flagFrance
24%
68%
2%
4%
50
flagPakistan
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41
flagSouth Africa
28%
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25
flagSweden
31%
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35
flagIndia
23%
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443
flagthe Philippines
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42

Gender

men77%
women80%
to have sharper vision
17%
15%
to better see in the dark
77%
81%
to be more attractive
0%
0%
it is a useless mutation
4%
3%

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Why do cats have vertical pupils?
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