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
flagAustria
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14
flagCanada
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47
flagthe Netherlands
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flagSweden
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flagPoland
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flagAustralia
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3%
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28
flagRepublic of Ireland
23%
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34
flagGermany
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150
flagItaly
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25
flagthe United Kingdom
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347
flagthe United States
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flagPakistan
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flagNorway
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flagthe United Arab Emirates
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flagFrance
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flagIndia
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flagDenmark
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Gender

men76%
women80%
to have sharper vision
17%
16%
to better see in the dark
76%
80%
to be more attractive
0%
0%
it is a useless mutation
5%
3%

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Why do cats have vertical pupils?
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