How the Eye Works Animation – How Do We See Video – Nearsighted & Farsighted Human Eye Anatomy

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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.

Comments

Johnier Cav Oh Naw Capulet says:

That's gravity hombre that spider pig linching mob wasn't the bandage

60's 70's & 80's Rewind Covers says:

How do we know green doesn’t look like red to someone else. Imagine someone who sees grass and trees every day and it’s red and that’s normal to them. Mind blown.

Klwglb Waterblack says:

for a start the eye does not create any image! it recieves electrical signals from the external world!!! that or those electrical signals are then sent to the brain. then the brain produces the image from the electrical (light) signals. same goes for all our senses. senses are the antenna, the brain is producer.

Askhimto Hat says:

Well ,i think to much complicated thinking killed the common sense

Image is never form upside down….
It's like example if my phone camera is in convex shape it's would turn the image to upside down…..??…na never
We may see the world with help of eye but it's information converted by cells and sent to brain which has no connection in physicality
Brain is never confused okay….
We are not seeing in mirror… …………
That's why I don't trust everything….

Plz share this wake everybody up.

Jon Bresee says:

Thanks for that it really did help me to do my homework!

عبدالله العزايزه says:

سبحان الله الخالق العظيم

khushi bhendekar says:

How was the image are corrected ?

Nitine Khodke says:

your very bad teacher

Surya Sankhala says:

I had2.7sight

Akshin Verma says:

helped me in school

Brian VandenBerg says:

1:23 Contractors Cough Cough

Retarded Spiderman says:

Who else looked this up while high?

فوسفولبيدات الاينوزيتول inositol phospholipids says:

I just can't understand how an image turned into an impulse?

Just some chilling lemon with no moustache says:

Pretty sure there are gonna be random ppl here shouting Alllalah is great

Sarina Sarina says:

So does that mean If I see you hanging upside down your image is reversed to downside up?

Dislike doesn't matter says:

How we get glasses playing much videogames or Reading to much books or touching the eye ball

Murph says:

I have now viewed the second half of the video. And if you believe what they say about a long or short eye, one would conclude as you grow older your eyes get longer and shorter on a daily basis. The only thing they have learned is by putting a lens in front of the eye it corrects the vision. I maintain and argue, the rest is conjecture and pseudoscience of the highest degree.

Murph says:

This is pseudoscience. They have been preaching this Theory since the beginning of Medicine. There is no absolute proof that the image is reversed onto the retina. This they conclude is the same result as holding a magnifying glass, where the image appears to be upside down. I argue… This only happens with a strong magnifying glass. if the lens is not that distorted, say that of your reading glasses, the images are NOT reversed and only comes in focus at a particular distance. I believe when people need eye glasses, it's because of a freak of nature the lens is not at the proper distance from the retina and corrective vision is necessary. Neither of which alter the image on the back of the retina. It makes far more sense that the image be upright and the brain do as little interpretation then what is necessary. Do your homework and research any proof that what they say in this video is factual. It is all conjecture or otherwise known as pseudoscience! and just a side note… color blindness is not an inflection and deemed a handicap, it is quite the opposite, these people can see extremely well in the dark. This seems to me as an advantage! Scientists argue, animals can't see Reds, but they don't realize that the same characteristics are of what we call color blindness in humans. And yet the animals have an uncanny ability to see in the dark. does anyone out there see the similarities? I was once told… Don't believe 90% of what you hear… and that other 10%? Only believe half! I think the 90% rule holds true to things on the internet. Have a pragmatic view on Analytics. Logical thinking will prevail!

Caleb Goes Viral says:

You are stupid

Shivaji Ukhade says:

Fabulous explanation ☺

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