Why do human beings close their eyelids every now and then?

  1. Kevin Peter profile image72
    Kevin Peterposted 4 years ago

    Why do human beings close their eyelids every now and then?

    Do animals also do the same. But why?

  2. german83 profile image65
    german83posted 4 years ago

    You mean blinking? I believe it is for lubrication of the eyeball (excluding the times it is because of some dust, or trouble with light)

 
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