Thank you all for your respons and upvotes.
I can now see and focus on the answer of my question 🙂
In: 3993
Your brain has control of the focus knob and that’s where perception happens. Eyes are actually part of the brain too!
I imagine that your that your eye mechanisms continue to focus until your brain says “stop, I recognize this data.”
Your eyes don’t actually record the whole frame of view. It takes many smaller snapshots of information and your brain uses them to create images. Focusing means you are taking in more data on a smaller area, when you are focusing your brain is filling in the background with old data, and maybe tracking large movements and such in the background for small changes. This is how magicians trick us, just because you are “watching”, doesn’t mean you see everything in view all the time. So you are right we don’t know the difference between focus and an illusion, but it has to be good to trick our experience. Kids have little experience, so illusions work well on them. As we gain experience, our brain can use that past data to better determine if we are actually focusing on something or being tricked. Movies for example use forced angles, so because we have to watch from a forced perspective their tricks work really well. Walk a movie set while filming and you aren’t tricked, because you can compare data from different perspectives.
The brain is a data processor and controller. It decides what focus means to it.
The same system that some cameras use to autofocus is used by the human eye. The focus is adjusted back and forth until the spot which has the highest contrast pixel-to-pixel (or cone-to-cone) is found.
Actually yeah! It’s pretty cool. Babies instinctually recognize human faces, and prefer those similar to their mother. Another neat thing is that babies will naturally make expressions, regardless if they have seen those expressions. By that, I mean even babies blind from birth will eventually smile when happy, frown when sad, and go wide-eyed when surprised or scared.
It’s really neat how much of human behaviour is influenced by evolutionary pushes.
Some quality responses from several commenters but I feel like a true ELI5 is missing. Here’s my take – How does the eye know when the image is in focus? How does the heart know what the heart wants? Why do birds suddenly appear, every time you are near? If a tree falls down in a forest and no one is around to hear, does it make a sound? How do I know if I’m a raging alcoholic?
Notice a pattern?
When older you also don’t perceive images too close. You also get something that is new to me and it unfocuses things randomly (typ. 45 ish).
I think it’s something in your eye getting hard (more solid).
I just learned this. If anyone knows more about the two I’d love to know more. Sorry if it is off topic but there is so much to understand.
fun fact, my eyes independently focus, so I can blur one and sharpen the other. turns out, the brain prioritizes the focused view.
You learn to see. The information that reaches the brain is upside down. Also what the inner half of the eye sees goes to the brain hemisphere on the opposite side. The outer half information goes to the hemisphere on the same side. With fine the brain learns to see; to unscramble the information.
At the beginning the eye doesn’t even focus. It’s focused on one distance. You can see this in infants when you get your face closer and farther away you can tell where that sweet spot is. It’s usually about two feet. With time they learn to focus at different distances.
Because this is a learned skill if a child that needs glasses doesn’t wear them, then if he decides in his teenage years that he wants to wear them to see better, he won’t. Or at least not as well as he would have if he would have worn his glasses early on. This is because the brain didn’t learn want a good image should be.
I don’t have an answer for this, but I will tell you WHY I don’t.
Because on that day of my college lecture where they explained the anatomy of the eye and how our brains perceive vision, I accidentally went to my 8 am class high on mushrooms.
So here’s the ELIHOMAWMITLTISB(Explain Like Im High On Mushrooms, And Way More Into The Lecture Than I Should Be):
They’re like little cameras in our skulls, that repeatedly focus over and over again, like a video, and our brain perceives each frame in real time, then plays the movie back to us immediately.
And SOMETIMES, the image ISNT in focus. So we wear glasses to put the image in focus, and then our eyes adjust again on top of that. Like attaching different lenses to the camera! We’re all just walking, talking video cameras, able to instantly understand and THEN write imdb reviews about what is being filmed, while we’re filming it!
Crazy right?!
Anyways, I got a C.
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