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    OHMYGLOB's Avatar
    OHMYGLOB Posts: 1, Reputation: 1
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    #1

    Dec 21, 2013, 12:09 AM
    Why when I shine a light close to my pupils it doesn't stay the same size?
    Why when I shine a light close to my pupils it doesn't stay the same size? Even after a couple a seconds it keeps changing size.
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #2

    Dec 21, 2013, 12:13 AM
    It is supposed to change size according to the light or dark. In bright light pupils will decrease in size and in the dark they will increase in size.
    joypulv's Avatar
    joypulv Posts: 21,591, Reputation: 2941
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    #3

    Dec 21, 2013, 05:44 AM
    Not only that, but many people have one pupil that is always a bit wider than the other. I do.
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,301, Reputation: 7692
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    #4

    Dec 21, 2013, 05:47 AM
    And some of us, they do not change fast enough, causing vision issues when light shone in our face.
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