How the Eye Works Animation - How Do We See Video - Nearsighted & Farsighted Human Eye Anatomy
ฝัง
- เผยแพร่เมื่อ 2 เม.ย. 2016
- The eye is the organ of sight and is shaped as a slightly irregular hollow sphere. Various structures in the eye enable it to translate light into recognizable images. Among these are the cornea, the lens, and the retina.
Light first passes through the cornea, a clear dome-like structure covering the iris, or colored part, of the eye. The cornea bends, or refracts, the light onto the lens. The light is then refracted a second time while passing through the lens, finally focusing on the retina. The retina is the light sensitive part of the eye. Impulses travel down the optic nerve to the occipital lobe of the brain, which then interprets the image in the correct perspective.
The shape of the eye is very important in keeping the things we see in focus. If the shape of the eye changes, it affects a person’s vision.
Normally, light is precisely focused onto the retina at a location called the focal point. A nearsighted eye is longer from front to back than a normal eye causing light to be focused in front of the retina instead of directly onto it. This makes it difficult to see objects that are far away. Glasses with concave lenses are used to correct nearsightedness. The concave lens focuses light back onto the focal point of the retina.
Farsightedness occurs when the length of the eye is too short. Light is focused at a point behind the retina, making it difficult to see objects that are up close. A convex lens is used to correct farsightedness because it directs the focal point back onto the retina.
How Your Eyes Work
When light rays reflect off an object and enter the eyes through the cornea (the transparent outer covering of the eye), you can then see that object. Rods and Cones in the retina
The cornea bends, or refracts, the rays that pass through the round hole of the pupil. The iris (the colored portion of the eye that surrounds the pupil) opens and closes, making the pupil bigger or smaller. This regulates the amount of light passing through.
The light rays then pass through the lens, which changes shape so it can further bend the rays and focus them on the retina. The retina, which sits at the back of the eye, is a thin layer of tissue that contains millions of tiny light-sensing nerve cells. These nerve cells are called rods and cones because of their distinct shapes.
Cones are concentrated in the center of the retina, in an area called the macula. When there is bright light, cones provide clear, sharp central vision and detect colors and fine details.
Rods are located outside the macula and extend all the way to the outer edge of the retina. They provide peripheral or side vision. Rods also allow the eyes to detect motion and help us see in dim light and at night.
These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain, which produces an image.
The human eye is an organ that reacts to light and has several purposes. As a sense organ, the mammalian eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors and is possibly capable of detecting a single photon.
Similar to the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.
Visual perception is the ability to interpret the surrounding environment by processing information that is contained in visible light. The resulting perception is also known as eyesight, sight, or vision (adjectival form: visual, optical, or ocular). The various physiological components involved in vision are referred to collectively as the visual system, and are the focus of much research in Linguistics, psychology, cognitive science, neuroscience, and molecular biology, collectively referred to as vision science.
Light entering the eye is refracted as it passes through the cornea. It then passes through the pupil (controlled by the iris) and is further refracted by the lens. The cornea and lens act together as a compound lens to project an inverted image onto the retina.
The retina consists of a large number of photoreceptor cells which contain particular protein molecules called opsins. In humans, two types of opsins are involved in conscious vision: rod opsins and cone opsins. (A third type, melanopsin in some of the retinal ganglion cells (RGC), part of the body clock mechanism, is probably not involved in conscious vision, as these RGC do not project to the lateral geniculate nucleus but to the pretectal olivary nucleus.) An opsin absorbs a photon (a particle of light) and transmits a signal to the cell through a signal transduction pathway, resulting in hyper-polarization of the photoreceptor. Rods and cones differ in function.
It's so dumb how are schools depend on memorizing and us students search ourselves for knowledge.
true
so true, just so dumb. I don’t know whether, if they know they are teaching to a kind of species "that can think.”
hell of dumbness, after the corona break, they don’t look like, they give a shit regarding our health.
I used to be very fond and respectful towards teachers, serously,
but, the hell of that, I don’t care a hell now.
I am seriously irritated.
Lol,our teacher shows us that vid,then explains it himself,if we didn’t get.Why doesn’t he just explain himself?!
School brainwashed our parents and we have no escape.
@@wbmw450It's all about the money. Poor nations are paying for being poor with their lives of their own citizens. Where I live in US the injections are available to everyone in our state. And now they are on a witch hunt for the extremely rare blood clots that really have happened. But only one in a million and they weren't ALL fatal...
Very interesting! I would love to see a video on the brain part of vision as well. It’s insane how much of vision is in the brain!
Human Memory stored exactly like RAM in a computer and once chips are placed into the brain everything will change.
❤
I normally do not give youtube comments. This definitely deserves a like and a comment. Thanks for the simple and clean explanation.
That was excellent! Good work! I learned more about the eye in 3 minutes and 22 seconds with your video than I did from a whole hour in science class back in the day...quite a way back.
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This is amazing and interesting video with animation.
Thank you so much
Thank u so much , this was a very big doubt for me cleared up
The eye is the organ of sight and is shaped as a slightly irregular hollow sphere. Various structures in the eye enable it to translate light into recognizable images. Among these are the cornea, the lens, and the retina.
Light first passes through the cornea, a clear dome-like structure covering the iris, or colored part, of the eye. The cornea bends, or refracts, the light onto the lens. The light is then refracted a second time while passing through the lens, finally focusing on the retina. The retina is the light sensitive part of the eye. Impulses travel down the optic nerve to the occipital lobe of the brain, which then interprets the image in the correct perspective.
The shape of the eye is very important in keeping the things we see in focus. If the shape of the eye changes, it affects a person’s vision.
Normally, light is precisely focused onto the retina at a location called the focal point. A nearsighted eye is longer from front to back than a normal eye causing light to be focused in front of the retina instead of directly onto it. This makes it difficult to see objects that are far away. Glasses with concave lenses are used to correct nearsightedness. The concave lens focuses light back onto the focal point of the retina.
Farsightedness occurs when the length of the eye is too short. Light is focused at a point behind the retina, making it difficult to see objects that are up close. A convex lens is used to correct farsightedness because it directs the focal point back onto the retina.
How Your Eyes Work
When light rays reflect off an object and enter the eyes through the cornea (the transparent outer covering of the eye), you can then see that object. Rods and Cones in the retina
The cornea bends, or refracts, the rays that pass through the round hole of the pupil. The iris (the colored portion of the eye that surrounds the pupil) opens and closes, making the pupil bigger or smaller. This regulates the amount of light passing through.
The light rays then pass through the lens, which changes shape so it can further bend the rays and focus them on the retina. The retina, which sits at the back of the eye, is a thin layer of tissue that contains millions of tiny light-sensing nerve cells. These nerve cells are called rods and cones because of their distinct shapes.
Cones are concentrated in the center of the retina, in an area called the macula. When there is bright light, cones provide clear, sharp central vision and detect colors and fine details.
Rods are located outside the macula and extend all the way to the outer edge of the retina. They provide peripheral or side vision. Rods also allow the eyes to detect motion and help us see in dim light and at night.
These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain, which produces an image.
The human eye is an organ that reacts to light and has several purposes. As a sense organ, the mammalian eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors and is possibly capable of detecting a single photon.
Similar to the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.
Visual perception is the ability to interpret the surrounding environment by processing information that is contained in visible light. The resulting perception is also known as eyesight, sight, or vision (adjectival form: visual, optical, or ocular). The various physiological components involved in vision are referred to collectively as the visual system, and are the focus of much research in Linguistics, psychology, cognitive science, neuroscience, and molecular biology, collectively referred to as vision science.
Light entering the eye is refracted as it passes through the cornea. It then passes through the pupil (controlled by the iris) and is further refracted by the lens. The cornea and lens act together as a compound lens to project an inverted image onto the retina.
The retina consists of a large number of photoreceptor cells which contain particular protein molecules called opsins. In humans, two types of opsins are involved in conscious vision: rod opsins and cone opsins. (A third type, melanopsin in some of the retinal ganglion cells (RGC), part of the body clock mechanism, is probably not involved in conscious vision, as these RGC do not project to the lateral geniculate nucleus but to the pretectal olivary nucleus.) An opsin absorbs a photon (a particle of light) and transmits a signal to the cell through a signal transduction pathway, resulting in hyper-polarization of the photoreceptor. Rods and cones differ in function.
Does the pupil size get larger when viewing distance or near?
Thanks a lot
Thank you, the video was really easy to understand
“I praise you because in an awe-inspiring way I am wonderfully made. Your works are wonderful, I know this very well”
Crystal clear explanation 💯💯👌👌👌
Thank u so much. And ur voice is so soothing, so sweet
Omg!!! I have learned a lot in this video, so conscience.
🎉❤
I highly recommend this video. ❤
Interesting and informative video helped me alot!!
this is helpful, thank you!
Thanks brother this is my doubt about my eye thanks for clearing my doubt see u soon brother
Ma Sha Allah.
Nice.
Thanks.
That was very simple to understand thank you 😊
I love your way of explanation
Thank you for your video😊
Excellent information, except that a concave lens is thinner in the middle and thicker around the edge. The simulated image at 2:40 is inaccurate because it shows a thicker middle/thinner edge, which is the definition of convex.
Good info. Thanks for it.
Thank you for sharing! ♥♥♥
Nice and easy to understand , thank you
beautiful eyes, i wish my eyes were like that 👀
I've learned everything bout the eyes.....short and long sightedness.. thanks
his is amazing and interesting video with animation.
Thank you so muchT
Excellent information thank you
Learning how our eyes work while our eyes are working at the same time to look at how our eyes work.
Does the brain know what is upside-down? I read about a psychologist back in the day that wore glasses that flipped images upside-down on purpose, and in 12 or so days his brain allowed him to perceive it as right side up.
the brain is always adapting. plasticity plays a key role. your brain is doing its best to maintain cohesion with reality.
Probably gravity that lets the brain know which way is down and up
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I heard a Doctor say that if a baby is blindfold at birth and the blindfold is then removed, after a certain amount of time the baby will never be able to see. And the reason has to do with the fact that man, with his large brain needed to be as efficient as possible so childbirth would be possible. the software comes AFTER birth for us, as opposed to a horse that does everything it ever does within minutes of its birth.
his name is Ivo Kohler... when he took the glasses off, he saw upside down again... after about a week he readjusted and was able to see right-side-up
2:02 if light focuses precisely on the retina then all colors should combine at the same point and make white and everything would appear white color to us, i think it should focus slightly front of retina(1:18) so different wavelentgh light waves can activate different cones to make 2D image of object
You are confused. If the light coming in is white, it would be perceived as white. If the colour is not white, eg looking at a coloured object, then the three cones would detect the different primary colours but these would be in different amounts and they would recombine to form the colour of the object and not white light. Your attempt to redesign the eye is misguided.
that would be the case if we had single photoreceptor with sensitivity to all the colours.
Thank you so much!
Thankyou so much 😊
Great video, thanks!
Very thankfull for your explanation
it'd be much better if you stated that the lens was the one with the incorrect shape, as the eye shape really doesn't affect the placement of the focal point, whereas the shape of the lens does. If the lens is too thick at a relaxed state then the focal point falls in front of the retina, if the lens is too thin at a relaxed state then the focal point falls behind the retina.
Actually incorrect. The cornea does way more focusing then the lens does. So a misshapen cornea causes the lens to be unable to compensate, and hence focus wrong.
@@dankmemesstudios3987after the focal point,then what,like isn't the image like really really really small,cause yea the focal point? do those photoreceptors calculate images this small
@@dankmemesstudios3987In school I haven't studied much on sense organs but in physics,Iv learnt that an image is in the between of the principal axis and the point of intersection of rays
but here all the parallel rays meet(that is the focal point) at the retina direct,and the eye is spherical type,so there is no space for the object rays to intersect,the hit the curvs of the retina too early
@@ajsenju9383 1) The rays don't converge at a perfect point, but small enough on the order of magnitude of the size of the eye to be considered a point. 2) Parallel rays focus at a point, but so do off axis parallel rays (rays that don't enter the eye straight on). They will focus at a different point in the eye.
@@dankmemesstudios3987 I think a generic image does not matter, a generic image is required for as an image is the arrangement of rays which the brain can process and interprit as some object,what the retina need is just photon,and the amount,angle and wavelength will send according signals,I think I might be right
thx bro got an exam tommrow and this really helps me out
He perfected everything he created.
What about those of us with glasses or hearing aids?
He creates everyone as equals but not same as others.@@courtneythiessen6832
0:23 snatched the soul out of me...did he really had to cut the eye in half?
😭😭
Great video !
Great understand, explained well
great video. I wished you would`ve titled it refraction though so it would have been easier to find. Thanks.
Thank you. ❤
Sir, can you please make science (class 11th & 12) detailed study easier through animation, so that students can find neet easy to crack ?
THANK YOU!!!
2:52 I knew it.......My massive brain is pushing on the back of my eyes...
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@@ahmedramis7541 Actually, the eyes are not connected to the brain. They ARE the brain. Direct outgrowths of the brain itself.
my body has loads of space because my brain doesnt take up much space
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Thank you ❤
Thanku for the precise explanation ☺️
Nice video
Thanks a ton
thank you so much
Legit scariest video ever it sounds so old it feels like one of those analog horror videos but unintentional
Thank you 😍😍
Praise the Lord for his wonderful creation. Amen 🙏
This was more than excellent 👌 👏 👍 🙌
Amazing
The human body is such a complicated machine, it boggles tf out of my mind to think about it lol
The boys
Thanks great explanation
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So the beams cross eachother right before hitting the retina so they can for an upside down image ? Please tell me when this crossing is happening.
Welcome, my long eyed and short eyed peeps.
greetings, my eyes are l o n g
Im trying to do research on the eye so that I can come up with a solution for this without needing glasses...
Also my eyes are red and Id like to know why...
Im not a doc though
I too, am researching the eye so I will no longer be in need of those darn glasses.
@Ravii Redmiii OMG you going to look creepy
@@MasterRons177 your eye Will look ok in the inside but the shape of your eye shape is longer or shorter
How does the double bending through cornea and lens form inverted image, it is only the convex lens of our eyes that form inverted image, cornea just bends light, doesn't do anything, am i right?
Grass is a plant with narrow leaves growing from the base. A common kind of grass is used to cover the ground in a lawn and other places. Grass gets water from the roots in the ground. Grass is usually pigmented with the colour ‘green’. Grasses are monocotyledon, herbaceous plants.
The grasses include the "grass", of the family Poaceae (also called Gramineae). Also sometimes it is used to include the sedges (Cyperaceae) and the rushes (Juncaceae). These three families are not closely related but belong to different clades in the order Poales. They are similar adaptations to a common life-style.
The true grasses include cereals, bamboo and the grasses of lawns (turf) and grassland. Uses for graminoids include food (as grain, sprouted grain, shoots or rhizomes), drink (beer, whisky), pasture for livestock, thatching thatch, paper, fuel, clothing, insulation, construction, sports turf, basket weaving and many others.
Many grasses are short, but some grasses, like bamboo can grow very tall. Plants from the grass family can grow in many places, even if they are very cold or very dry. Several other plants that look similar but are not members of the grass family are also sometimes called grass; these include rushes, reeds, papyrus, and water chestnut.
Grasses are an important food for many animals, like deer, buffalo, cattle, mice, grasshoppers, caterpillars, and many other grazers. Unlike other plants, grasses grow from the bottom, so when animals eat grass they usually do not destroy the part that grows. Without grass, dirt can wash away into rivers (erosion). Graminoids include some of the most versatile plant life-forms. They became widespread toward the end of the Cretaceous. Fossilized dinosaur dung (coprolites) have been found containing grass phytoliths (silica stones inside grass leaves).[Grasses have adapted to conditions in lush rain forests, dry deserts, cold mountains and even intertidal habitats, and are now the most widespread plant type. Grass is a valuable source of food and energy for many animals.Lawn grass is often planted on sports fields and in the area around a building. Sometimes chemicals and water is used to help lawns to grow.
People have used grasses for a long time. People eat parts of grasses. Corn, wheat, barley, oats, rice and millet are cereals, common grains whose seeds are used for food and to make alcohol such as beer.
Sugar comes from sugar cane, which is also a plant in the grass family. People have grown grasses as food for farm animals for about 4,000 years. People use bamboo to build houses, fences, furniture and other things. Grass plants can also be used as fuel, to cover roofs, and to weave baskets. n English, the word "grass" appears in several phrases. For example:
"The grass is always greener on the other side" means "people are never happy with what they have and want something else." "Don't let the grass grow under your feet" means "Do something". "A snake in the grass" is about a person that will not be honest and will trick others. Grass is sometimes used as a slang term for cannabis (also called pot, weed, or marijuana)
Succinct! Much love!
Thank u
I have a exam tommorow!
i literally love you
Thanks!!! It helped a lot in 'ma biology presentation.
Thank you
Do u know what u should add background music to make it more interesting
Thank you very much
it is so use full to study our eye
POV: You searched how does vision work at 1am
Bro last time I saw a cat playing on a chair at 1am but I guess I was just hallucinating bec we don’t even have a cat
Slight correction: How does the eye work
2ndly: 3am.
Close anyways haha
It's literally 1:17am😂
it's literally 1 am rn😂
does this mean what we are seeing are only projections of what is out there or are we seeing the things in themselves?
Ooo, good question! The answer would be yes... and no! We see objects when light is reflected off of them, then that light enters our eyes. The interpretation of what we see is based on our brains ability to make sense of it. Unfortunately, some peoples receptors that catch the entering light do not work as they are supposed to, so they either don't see it, or they see it distorted or they see it in a different color. And I won't even begin on what the brain can do with that information!!
Thank u very much
I was looking for a video explaining how a healthy eye deals with focusing the image at varying focal ranges.
That is, without external optics...
though that's not saying that this isn't cool information, I was hoping to see if it's possible to build a pair of glasses that can actively compensate for weakening eyes
Photogenic memory. The eyes in development from 0 to 100 we must appreciate to it's fullest. Take care of innocence. The master comes back to see. ✌️😷🤓😇🤲🏹
My left eye is optic nerve damage have you any treatment sir case is bike accident 20/3/20
Thanks for that it really did help me to do my homework!
Nice video, unfortunately you got the part about focussing wrong. You need to mention the lens changes shape to focus objects placed at different distances onto the retina. Corrective glasses are needed if the lens can no longer achieve this task. Very misleading !
th-cam.com/video/AI7s-kGofIw/w-d-xo.html
thanks!
That music gave me a heart attack😂
A
😂😂
I read this immediately after thinking that🤣
So people with 20/20 vision have a eye length somewhere in between ?
This helped me alot
thanks!
Muscular destropy have any remedy?
Thanks Amaan
Interesting..!!
Yes interesting! You look with the eye you see with brain, which means you and the world is in your head rightnow. The external world you think is external in actually internal
Thanks I have exam tomorrow of science and I was confused you helped me
Same here XD
awsome
Old but gold
nice video
tq
What I now say is a true experience I had: For a few years ago I was at our backyard and I watched at the trees. Suddenly without any advance warning I saw the trees upside down. The trees was where the sky should have been, and the ground was where the sky should have been. But just for a second or less. Then after a few seconds more it happened again. Again, only for a second or less. Then after a few years I watched a TV-program where a doctor was speaking about the human eyes, and then I understood what had happened to me that day. It had to do with my brain, and it was only for a second or two (2x1= 2) and then it was over. I have not experienced that thing anymore, and I thank God for that. The life would be a mess if you don't know what is up and what is down.
Dear fellow believer ! I appreciate that you gave credit to God ! I just released a similar video followed by a Bible study suggestion on Apostle Paul . In awe of our creator and redeemer , Suzanne Shera, Author of Lightlab
Can we use our eyes in camera??
Can our eye lens use in camera and anything els??
can you expain opsin nd rectinal protien ? related this topic
When I search for 'focal point' (mentioned in your video) I cannot find 'focal point' anywhere, not with reference to the eye at least.
Soooooo no one ever questions that everything is ACTUALLY upside down and our brain just “fixes” it???
But the rays are converging in the middle so why the image is being formed on retina
Fabulous explanation ☺
2:42 - concave lens doesn’t diverge rays.
I'm confused are objects represented on the retina as a point "focal point"
or an inverted image
Focal point is the location in retina where the inverted image is formed. But people with near/ far sightedness have their focal points either in front of the retina or beyond the retina. So concave and convex lenses are used to correct it.
I see your problem and it's perfectly understandable. The focal point of the lens needs to be on the retina or a blurred image will result. But the image we perceive is an amalgam of all the images being formed simultaneously across the entire retina. We don't really see "an image" at all, but how else would you like people to talk about it?
❤❤❤❤❤❤❤2.42..... timing ...... for correction of near sight problem we have to use concave lens........ u said also same in video.... but in the diagram that is not a concave lens..... its like a convex lens........ so better to avoid confustion at 2.42 timing concave lens matter❤❤❤❤❤
Nice and very 👌👌clear
so,do we receive vision like sounds ? then self is really an illusion
Terrific, thanks!