Why can't my brain correct my vision (details)?
If this is how we really see, and our brain corrects it to how we see now, why can’t it fix blurry vision?
That image is blurry, upside down, black spots, weird eye veins and our brain has no problem correcting it.
I get vision is also how light hits our eyes, but you cannot tell me that image above has nothing to do with the way light hits our eyes?
So, why can I not see? My vision is really bad, everything blends together. I could not function without my glasses, literally.
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My prescription is -6 right eye, and -7 left eye.
Not entirely sure I understand the question. Are you asking why is it you can’t see without your glasses or are your glasses not working?
Oh sorry. I can try to rephrase.
The image I posted is what our eyes see, but our brain corrects it so we don’t see the black spots, it is not upside down, etc.
That is quite a correction.
So I am asking, if our brain can correct that much weird information, why can it not fix blurry vision. Why does anyone need glasses?
Edit: Yes, I used myself as an example. Sorry. That probably confused things.
The brain will correct an image that is in focus, but it can’t correct a bad image.
It already is correcting a bad image, is it not?
I am seriously not understanding this. ChatGPT says it works because it is a consistent distortion that our brain corrects, but surely my blurred vision has been distorted long enough for it to be consistent?
I get what you mean Zenvelo it just is not clicking in my brain.
Can your brain translate Swahili without ever hearing it before ? ?
But I haven’t been blind since birth! And if we always see distorted, how does our brain know what “normal” is?
To your analogy, the clear image we see would be the foreign language, since the real image is highly distorted
So you can speak and understand Swahili ? ?
Nope, but my eyes can understand “normal” right side up vision without ever having seen normal vision since birth.
Ah. The eye focuses to the retina much like a lens focuses on film (or a CMOS chip). The image on the retina (and the CMOS chip) is upside down and backwards. The brain and the camera software will flip it. But neither the camera nor the brain can focus an image that is unfocused.
The eye doesn’t actually transmit a picture to your brain. The brain receives the image as a pattern of nerve impulses, not a replica of the retinal image, but you still need to have parts of your eye sending the correct images. Think of it like looking at something through the bottom of a thick glass bottle vs. clear glass. The thick bottle will distort what is behind it but the clear glass will not.
I remember once driving during a snow storm and I saw something far off that looked to me that it may be an injured animal. My daughter did not think it was an animal. As we got closer we both saw it was garbage. So my brain was working off of memory of what a wounded animal on the side of the road may look like from a distance but it was wrong. It was an educated guess of sorts but my vision for distance was okay at that time.
For you to see as clearly as possible the following has to be perfect (at least perfect for the human brain).
The rods are sensitive to low light and provide vision in dim conditions.
The cones are responsible for color vision and sharp details.
The eye’s ability to focus on objects at different distances is achieved by the lens changing its shape.
The brain has a visual cortex that processes and interprets the visual information received from the eyes. But its kind of like what @Tropical_Willie was trying to say.
Yes you have seen these images before but they have been distorted due to damage in your eyes. So your brain can try to understand these images but its getting really foggy images now. It cannot interpret what it doesn’t know.
Okay, I think I understand.
@Pandora, I was looking at things from a distance without my glasses to test. All I can see (roughly 11 feet away) on my TV is colors. I cannot see any details whatsoever, only blends of colors if they are contrasted enough. A black outline totally disappeared on an orange background, so all I saw was orange.
I guess I can see how that level of distortion would not be so simple to correct.
I also forgot the pictures are sent through nerve impulses.
Thank you all.
I think it is because the brain fills in the missing pieces of what you see, but it cannot see what is extremely blurry. If your eye cannot adjust to refine what you are seeing enough to identify it, it can’t fill in or invent what is missing.
I do think it varies somewhat among different people though. I think my husband needed glass when his sight was similar to what mine is now, and I can still read without glasses. His frustration level was higher with not being able to see clearly anymore.
Just wait until you get floaters. Talk about frustration! And everybody will get them at some point.
Wait. What does “blind from birth” mean?
I got my first glasses in 4th grade and had to have a stronger prescription so often,that I was “legally blind” by the 6th grade.
“Blind” means everything is black. You don’t see anything. “Legally blind” means you can see colors and shapes but it’s so blurry that you are legally required to wear glasses when you drive.
(Floaters are just random dead blood cells that sometimes find their way to the eye. Everybody gets them. It’s not because of age.)
I am exaggerating. I got glasses when I was like 7.
So legally blind. You had 7 years to learn what things are supposed to look like.
That actually happens in the first few months after you’re born.
Ok. Mine was that bad. I could not pass a driving test with out them. It said so on my license.
I got Lasik in 1999 so I don’t remember the script numbers from before that.
At the pool I had to memorize the colors on my friend’s suits,and the patterns be cause I couldnt see their faces from 10 feet away.
Yes but since when your sight is corrected you’re ok, you’re not legally blind. If you were legally blind, your sight would be so bad even with glasses that you couldn’t drive.
It was corrected with glasses. But it was noted on my driver’s that I was required that I wear glasses when driving. And if I got pulled over and wasn’t wearing them, I’d be legally in trouble.
My optometrist told I me I was legally blind. So you had info that spelled out exactly what that meant. They left out all the offical numbers and stuff, or maybe I forgot. This started in the 60s.
Yeah, glasses are a requirement for me also when driving. I am not legally blind either.
Even if I did not have to legally wear my glasses while driving, I still would. I would get in a crash and die without them
Having to wear glasses to drive means you definitely weren’t legally blind, Dutchess, because if you were legally blind, you couldn’t drive even with glasses on.
I understand @jca2. Thanks for the info.
Right @MakeItSo1701???!!! I guess it would be one way to commit suicide!
Legally Blind can’t be corrected to 20/40 with glasses, which is what you need to drive. Maybe without glasses you are close to the lower minimum of legally blind with glasses. Probably the term was used casually and not literally when it was said to you.
I’ve already had that explained to a couple different time.
Thank you @JLeslie
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