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What were you surprised to learn wasn't actually normal? (lemmy.world)
submitted 1 year ago by to c/asklemmy@lemmy.world
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[+] 37 points 1 year ago* (last edited 1 year ago) (7 children)
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  • [–] 13 points 1 year ago (1 child)

    Also, apparently some people can’t consciously control the focus distance of their eyes.

    This was a surprise for me as well as a child. I thought my eyes would change in how they look when I made them blurry, but yeah, you can't see that.

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  • [–] 1 point 1 year ago

    Yeah all I can do is make my vision blurry, but I can't consciously adjust the distance at which I place my focus, it's just where I look. I was surprised by the fact that my eyes looked the same too.

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  • [–] 10 points 1 year ago (2 children)

    That's interesting, for most people the brain just substitutes in the image of where your eye moves to, so it feels instantaneous. (there's no noticeable blindness) But you can see throughout the full movement?

    In a similar vein, I never understood having a "dominant eye". I honestly don't really understand the concept, I guess most people's brains will cancel out information from one eye?

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  • [–] 5 points 1 year ago* (last edited 1 year ago) (4 children)
    • Hold out your arm at arm's length
    • Make a circle with your thumb and index finger
    • Look through the circle at an object on the other side of the room
    • Now slowly bring the circle back to your eye, such that your fingers never obscure the object, and it's always centered in the circle

    Which eye did your circle arrive at?

    !That's your dominant eye!<

    Edit: formatting, I'm a Markdown dumbass

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  • [–] 4 points 1 year ago (1 child)

    I've heard of this test before, and it makes no sense to me. If I focus on a distant object, I see two images of my hand, one for each eye. So I'd have to choose which one to put over the object.

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  • [–] 2 points 1 year ago (1 child)

    What? I think most people see them together. Do you have to consciously compare the two images to perceive depth?

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  • [–] 1 point 1 year ago (1 child)

    Not at all, I perceive depth fine.

    If I focus back on my hand, the two images align, and I see both images of the background. It's just that I'm always seeing information from both eyes.

    If anything, from my perspective it's everyone else who I would expect to have difficulties with depth perception. You're only perceiving one eye consciously, (In the binocular overlap region), and the other eye is just used for depth information by your subconscious, is that correct?

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  • [–] 3 points 1 year ago* (1 child)

    No the brain does funky stuff mixing the pictures together. If I move something close enough to my face it appears in view twice seemingly semi-transparent. The rest of my visual perception remains unaffected though.

    Are you also constantly aware of your blind spot(s)? (Something that with the single image is completely invisible)

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  • [–] 1 point 1 year ago

    If I move something close enough to my face it appears in view twice seemingly semi-transparent

    That sounds like what I experience, not just for things very close to my face, whenever my eyes are aligned to something in front or behind.

    But in order to do the dominant eye test, you need to only see one image in the foreground and background simultaneously. So how does that happen unless the view from one eye is at least partially supressed?

    This is one of those things that's really hard to talk about and describe, but I would love to actually understand it. Also no, I can't notice my blind spots.

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  • [–] 1 point 1 year ago

    That's interesting, I can see both circles but my hand does always go to my right eye unless I force myself to look at the other. That makes sense I guess because my right eye is more focused at a distance. I wonder if that switches though when I look at something close up for a while, because my left eye is more focused then.

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  • [–] 4 points 1 year ago (1 child)

    My eyes still focus automatically (though a bit slow sometimes). But if I want to, I can get my eyes out of focus pretty easily.

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  • [–] 1 point 1 year ago

    I'm kind of weird I think in that I can focus further away than something I'm looking at, but I can't focus closer than something I'm looking at. At the same time though I can cross my eyes to converge closer, but can't push them apart to converge further away.

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