- published: 19 May 2016
- views: 195191
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.
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.
The eye is not shaped like a perfect sphere, rather it is a fused two-piece unit. The smaller frontal unit, transparent and more curved, called the cornea is linked to the larger white unit called the sclera. The corneal segment is typically about 8 mm (0.3 in) in radius. The sclerotic chamber constitutes the remaining five-sixths; its radius is typically about 12 mm. The cornea and sclera are connected by a ring called the limbus. The iris is the colored circular structure concentrically surrounding the center of the eye, the pupil, which appears to be black. A device known as an ophthalmoscope is used to see inside the eye.
Modern humans (Homo sapiens, primarily ssp. Homo sapiens sapiens) are the only extant members of Hominina clade (or human clade), a branch of the taxonomical tribe Hominini belonging to the family of great apes. They are characterized by erect posture and bipedal locomotion, manual dexterity and increased tool use, and a general trend toward larger, more complex brains and societies.
Early hominins—particularly the australopithecines, whose brains and anatomy are in many ways more similar to ancestral non-human apes—are less often referred to as "human" than hominins of the genus Homo. Some of the latter used fire, occupied much of Eurasia, and gave rise to anatomically modern Homo sapiens in Africa about 200,000 years ago. They began to exhibit evidence of behavioral modernity around 50,000 years ago, and migrated in successive waves to occupy all but the smallest, driest, and coldest lands.
The spread of humans and their large and increasing population has had a profound impact on large areas of the environment and millions of native species worldwide. Advantages that explain this evolutionary success include a relatively larger brain with a particularly well-developed neocortex, prefrontal cortex and temporal lobes, which enable high levels of abstract reasoning, language, problem solving, sociality, and culture through social learning. Humans use tools to a much higher degree than any other animal, are the only extant species known to build fires and cook their food, and are the only extant species to clothe themselves and create and use numerous other technologies and arts.
Eyes are the organs of vision. They detect light and convert it into electro-chemical impulses in neurons. In higher organisms, the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods.
The simplest "eyes", such as those in microorganisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment and to the pretectal area to control the pupillary light reflex.
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You will learn about "Human Eye" in this video. The human eye is one of the most valuable sense organs that enables us to see the world around us. Let us study about the different parts of an eye. Sclera is a tough outer coat that protects the entire eyeball. Choroid is a vascular layer of the eye. It contains blood vessels that nourish the inner parts of the eye. Cornea is the front portion of the eye. It is convex in shape and bulges outside. Light enters the eye through the cornea. Iris is a dark muscular diaphragm located just behind the cornea. It regulates the amount of light entering the eye by adjusting the size of the pupil. Pupil is a hole in the middle of the iris. Size of the pupil decreases or increases depending upon the intensity of light entering the eye. It is made up of a...
For more information: http://www.7activestudio.com info@7activestudio.com http://www.7activemedical.com/ info@7activemedical.com http://www.sciencetuts.com/ 7activestudio@gmail.com Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. The human eye: is the most valuable and sensit...
Watch 700+ videos on Basic Medical Sciences at http://www.DrNajeebLectures.com
We depend on our eyes more than any other sense, however many of us take this precious gift for granted. Without them, we could not experience a beautiful sunset, see the faces of our loved ones, or view the natural marvels of the world. We rely on our eyesight for so much, but most people have only a vague idea of how our eyes work. There are actually many different parts of the eye working together to form a unique self-sustaining system. Though smaller than a ping-pong ball, the eye allows us to see, while cleaning, moisturizing and disinfecting itself at the same time. Learn more at www.biotrue.com.
10 Things no person has ever seen! Subscribe: https://goo.gl/Hnoaw3 ----------------------------------------------------------------------------------------- Other Videos you might like: THIS Is How Lipstick Is Made https://youtu.be/CCsaHctc0r4 10 WTF Viral Beauty Hacks https://youtu.be/GkiJWQgXhS4 10 Things You Didn't Know About Everyday Objects https://youtu.be/ZcYW-Yt_vjE 10 Struggles Only Girls Can Understand https://youtu.be/wWwcwwNketU Description: As humans, we believe we can see and experience everything. But the truth is, there’s much more to life than what meets the eye. The limitations of our eyesight mean we’re missing out on seeing some pretty interesting things. Here are a few things the human eye can’t see. --------------------------------------------------------------...
This is introductory lecture on a CBSE Class 10th topic - The Human Eye and the Colorful World. This chapter is divided into 6 lectures, so make sure you watch the other five lectures for a better understanding. Link to more videos on various topics - http://bit.ly/2cncdM0
I created this video with the YouTube Video Editor (http://www.youtube.com/editor)
This is the video of Class 10 Science - The Human Eye and The Colorful World. Topics covered in this video are as follows- Here is a demo of online video lecture. You can watch this complete video at http://www.dronstudy.com Alternatively, visit this URL to access this chapter directly http://dronstudy.com/video/class-x-the-human-eye-and-the-colourful-world/ ..... All the above mentioned topics are described in an interactive and efficient manner so that the students could easily understand them. Here is the list of important URLs related to dronstudy.com Youtube Video Link: https://www.youtube.com/watch?v=EmhHGFLXQXM Youtube Channel Link: http://www.youtube.com/channel/UCPiuJvuyMVFSwcIdBCTpTyQ Website Link: http://www.dronstudy.com Facebook Page:https://www.facebook.com/pages/Dronstudy...
How to draw the structure of human eye. I have also draw an eye and label it. How to draw human eye step by step for beginners in this video I have told how to draw #retina, #optic nerve, #Iris, #ciliary muscle, #cornea, #Humaneye, #sketch, #Drawing. When we say that a person has green eye, we refer actually to the colour of Iris. The size of pupil is control by the iris. Behind the cornea we find dark muscular structure is called iris. This is the about of human eye. how to draw human eye diagram. At the junction of optic nerve and the retina there are no sensory cells, so no vision he is possible at spot this is called blind. Care of the eyes, how to draw a eye diagram, So far you’ve learned how to experiment with simple thumbnail sketches, how to refine the thumbnails into a rough ske...
You will learn about "Human Eye" in this video. The human eye is one of the most valuable sense organs that enables us to see the world around us. Let us study about the different parts of an eye. Sclera is a tough outer coat that protects the entire eyeball. Choroid is a vascular layer of the eye. It contains blood vessels that nourish the inner parts of the eye. Cornea is the front portion of the eye. It is convex in shape and bulges outside. Light enters the eye through the cornea. Iris is a dark muscular diaphragm located just behind the cornea. It regulates the amount of light entering the eye by adjusting the size of the pupil. Pupil is a hole in the middle of the iris. Size of the pupil decreases or increases depending upon the intensity of light entering the eye. It is made up of a...
For more information: http://www.7activestudio.com info@7activestudio.com http://www.7activemedical.com/ info@7activemedical.com http://www.sciencetuts.com/ 7activestudio@gmail.com Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. The human eye: is the most valuable and sensit...
Watch 700+ videos on Basic Medical Sciences at http://www.DrNajeebLectures.com
We depend on our eyes more than any other sense, however many of us take this precious gift for granted. Without them, we could not experience a beautiful sunset, see the faces of our loved ones, or view the natural marvels of the world. We rely on our eyesight for so much, but most people have only a vague idea of how our eyes work. There are actually many different parts of the eye working together to form a unique self-sustaining system. Though smaller than a ping-pong ball, the eye allows us to see, while cleaning, moisturizing and disinfecting itself at the same time. Learn more at www.biotrue.com.
10 Things no person has ever seen! Subscribe: https://goo.gl/Hnoaw3 ----------------------------------------------------------------------------------------- Other Videos you might like: THIS Is How Lipstick Is Made https://youtu.be/CCsaHctc0r4 10 WTF Viral Beauty Hacks https://youtu.be/GkiJWQgXhS4 10 Things You Didn't Know About Everyday Objects https://youtu.be/ZcYW-Yt_vjE 10 Struggles Only Girls Can Understand https://youtu.be/wWwcwwNketU Description: As humans, we believe we can see and experience everything. But the truth is, there’s much more to life than what meets the eye. The limitations of our eyesight mean we’re missing out on seeing some pretty interesting things. Here are a few things the human eye can’t see. --------------------------------------------------------------...
This is introductory lecture on a CBSE Class 10th topic - The Human Eye and the Colorful World. This chapter is divided into 6 lectures, so make sure you watch the other five lectures for a better understanding. Link to more videos on various topics - http://bit.ly/2cncdM0
I created this video with the YouTube Video Editor (http://www.youtube.com/editor)
This is the video of Class 10 Science - The Human Eye and The Colorful World. Topics covered in this video are as follows- Here is a demo of online video lecture. You can watch this complete video at http://www.dronstudy.com Alternatively, visit this URL to access this chapter directly http://dronstudy.com/video/class-x-the-human-eye-and-the-colourful-world/ ..... All the above mentioned topics are described in an interactive and efficient manner so that the students could easily understand them. Here is the list of important URLs related to dronstudy.com Youtube Video Link: https://www.youtube.com/watch?v=EmhHGFLXQXM Youtube Channel Link: http://www.youtube.com/channel/UCPiuJvuyMVFSwcIdBCTpTyQ Website Link: http://www.dronstudy.com Facebook Page:https://www.facebook.com/pages/Dronstudy...
How to draw the structure of human eye. I have also draw an eye and label it. How to draw human eye step by step for beginners in this video I have told how to draw #retina, #optic nerve, #Iris, #ciliary muscle, #cornea, #Humaneye, #sketch, #Drawing. When we say that a person has green eye, we refer actually to the colour of Iris. The size of pupil is control by the iris. Behind the cornea we find dark muscular structure is called iris. This is the about of human eye. how to draw human eye diagram. At the junction of optic nerve and the retina there are no sensory cells, so no vision he is possible at spot this is called blind. Care of the eyes, how to draw a eye diagram, So far you’ve learned how to experiment with simple thumbnail sketches, how to refine the thumbnails into a rough ske...
Anatomy and Physiology of Vision about the eye all about the eyes about human eye all about the eye facts about the eyes simple diagram of the eye defects of human eye about the human eye uman eye for kids human eye and its parts humen eye pictures of the eyes what is the human eye the anatomy of the human eye human eye and its defects physiology of eye vision physiology of human eye the eye lens lens for eye binocular eyes human body eyes all about the human eye anatomy & physiology of eye human eye anatomy and physiology anatomy and physiology of human eye human eye physiology lens in human eye about the eyes facts on the eye complex eye human eye system anatomy and physiology of the human eye physiology of the human eye introduction of eye eye introduction aids to the human...
Introduction to human eye simulations in ASAP using the BIO Toolkit. Demonstrations of the Advanced Human Eye Model (AHEM) for use with ASAP.
human eye and colourful world class 10 full chapter FOR SA2 EXAM SAMPLE PAPER CLICK HERE https://www.youtube.com/watch?v=wELli3WZFOQ&t;=1450s FOR COMPLETE VIDEO VISIT http://www.dronstudy.com/ YOUTUBE CHANNEL LINK https://www.youtube.com/channel/UCPiuJvuyMVFSwcIdBCTpTyQ CONTENT IS COPY RIGHT UNDER DRONSTUDY.COM human eye, science, class X, cbse, physics, cbse online, online cbse, dronestudy, class 10 human eye and the coloureful part, Eye (Quotation Subject), Human Eye (Anatomical Structure), K–12 (School Category), school, education, CBSE, NCERT, Learn, Science, Physics ESMART CLASSES
Important Information For All Human Eyes. Please Watch This Video.
A violent disorder stakes claims of it's righteousness
over the border
it feeds on those who eat up the bones of it's
casualties
the momentum of each daily cycle of "you're not me"
YOU'RE NOT ME A burn for a burn is as useless as apathy
we must make choice through action no matter the
fraction we stand for
gutting it's name and denouncing it's claims of "you're
not me"
YOU'RE NOT ME
It's in your mind Travel through time
It's in your face forgotten place
It's in your hands Forgotten lands
I'm twisting and turning
I'm buning my insides
I'm breaking on fire,
"Woe!" she cries no more, for you!
Eyes watching in the dark like a song done well or a
spell gone awry
and all the books were burned with any insight on how
to fix the wrongs back to right
gottah gather all together all of us a re running
scattered and we're pointing out that
you're not me
holding off your future dreams you'd rather scream in
fear that the not-me party is marching on
not like it's the only one
time
here
everyday for many long years people die Iraqis lacking
food and in health supplies
sanctioned by the brother with no compassion for the
other
with one outstretched hand the other rapes the land
in the name of democracy, flag of hypocrisy,
war is second nature there we're quick to turn in our
neighbor
the young have war in their eyes oh how this mighty
nation cries
"You Witch!"
"Communist"
"Pinko"