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Human Eye Powerpoint Template

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HUMAN EYE

Transcript: HOW DOES LIGHT REACH RETINA? HOW DOES THE LENS FOCUS LIGHT FROM DIFFERENT DISTANCES? The blind spot is the result of no light receptors at the area where the optic nerve joins the retina. You won't notice the blind spot because the eyes help each other. The iris is a thin and circular thing in the eye that controls the size of the pupil and controls the amount of light. Introduction The eye is structurally designed to detect and process light. The cornea and the crystalline lens are both important for the eye to focus light. The eye focuses with the light to focus, and that happens in the retina. HUMAN EYE BY: KAZUHIRO How does the human eye works? WHAT IS THE FUNCTION OF THE IRIS? http://library.thinkquest.org/C005949/fun/blindspot.htm http://www.livescience.com/3919-human-eye-works.html http://www.ask.com/question/what-is-the-function-of-the-iris Bibliography The retina reflects the light rays. The light rays go through the pupil and pass into the interior part of the eye. HOW CAN YOU TEST FOR YOUR BLIND SPOT?

Human Eye

Transcript: Sclera - also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the eye containing collagen and elastic fiber, the whole sclera is white, contrasting with the coloured iris. Central Retinal Artery - branches of the ophthalmic artery, running inferior to the optic nerve within its dural sheath to the eyeball. How to Apply Contact Lenses Ciliary Process - are formed by the inward folding of the various layers of the choroid, i.e., the choroid proper and the lamina basalis, and are received between corresponding foldings of the suspensory ligament of the lens. Lens Nucleus - The crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, thus allowing a sharp real image of the object of interest to be formed on the retina. Retina - is a light-sensitive layer of tissue, lining the inner surface of the eye. Cornea - is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Inside the Human eye Human Eye Vitreous Humor - is the clear gel that fills the space between the lens and the retina of the eyeball of humans and other vertebrates. It is often referred to as the vitreous body or simply "the vitreous". Ciliary Zonules - is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. Choroid - also known as the choroidea or choroid coat, is the vascular layer of the eye, containing connective tissue, and lying between the retina and the sclera. The human choroid is thickest at the far extreme rear of the eye (at 0.2 mm), while in the outlying areas it narrows to 0.1 mm. About the Human Eye Pupil - is a hole located in the center of the iris of the eye that allows light to enter the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. Iris - is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. The color of the iris is often referred to as "eye color." Lense Cortex - the tissue that surrounds the lens nucleus

Human Eye

Transcript: Most commonly experienced is the disorientation a person will feel when leaving a movie theater in the middle of the day.... When leaving a room that is extremely dimly lit then entering the outside world where the sun is blasting fucking rays at you at a rate that is not important... Your cones and rods must adjust to immediately give vision. They must switch to allow the cones to power over as to them being less light sensitive and more easily distinguish pigmentation... While the rods were extremely important inside the theater because in a dim lit room you must still be able to function so rods take forefront and act to give you ability to see in dark areas Basic Bitch Terminology Cones: active at higher light levels (photopic vision), are capable of color vision and are responsible for high spatial acuity Rods: responsible for vision at low light levels (scotopic vision). Do not mediate color vision; have a low spatial acuity together both the cones and rods allow images to be processed one transfers light differentiation (cones) the other delegates intensity of light (rods) Optic Nerve: nerve that transmits impulses to the brain from the retina at the back of the eye Retina: layer at the back eye containing cells that are sensitive to light and trigger nerve impulses that pass via optic nerve Cornea: transparent layer forming the front of the eye Lens: biconvex structure in the eye that helps refract light to be focused on the retina Iris: membrane behind the cornea of the eye with an adjustable circular opening in the center Photoreceptor: sensory cells that are found in the retina that respond to light Image Transition Overview movie theater effect Human Eye: Functions in Vision location of basic bitch terms Eye Arrangement grasping the knowledge at the basic bitch level of eye functioning in correspondence with the brain complete lie...way above basic bitch level.. comprehension of how images enter eye transition of how photoreceptors interpret light into electrical pulses completion of brain interpreting pulses to image Photoreceptors Cones vs. Rods When the eyes focus on an object, light will enter the eye through the pupil. The iris adjusts the size of the pupil based on light intensity. The light is then focused onto the back of the eye, the retina, by the lens. The retina's photoreceptors react changing the signals into electrical pulses to send through the optic nerve creating an image in our brain. light is received through the cornea, works as a focusing mechanism to target the optimal reception onto the retina light hits on the retina directly responding are the photoreceptors image in the eye is produced upside down all takes place before the brain even makes sense of what it is seeing, hence no one notices seeing the world upside down Conspectus Light to Retina

Human Eye

Transcript: Human Eye Anatomy of the eye Vision Normal vision: One considered to have "normal vision" is one who has 20/20 vision. Essentially one has 20/20 vision if he/she can read the Snellen eye chart from twenty feet away. In normal vision the cornea bends or refracts the rays that pass through the pupil. Common vision problems: Myopia (nearsightedness): a type of refractive error in the eye - a condition of the eye where the light that comes in does not directly focus on the retina but in front of it Hyperopia (farsightedness): a type of refractive error in the eye - a condition in which light is focused behind the retina in the back of the eye From the Eye to the Brain When light first enters the eye it first passes through the cornea, the primary lens in the eye, then passes through two other lens, the aqueous humor, then the vitreous humor and then ultimately reaches the retina where it essentially gets processed through receptor cells known as rods and cones. The cones handle color vision and process details whereas the rods are processed in low light and can only detect neutral colors such as black and white. These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain where an image is produced. Works Cited http://www.afb.org/seniorsite.asp?SectionID=63&TopicID=286 Sclera: white, tough wall of the eye, it keeps the eyes shape and protects its delicate internal parts Cornea: clear, dome-shaped surface that covers the front of the eye, most powerful lens in the eye's optical system Iris:colored part of the eye, a ring of muscle fibers located behind the cornea and in front of the lens, contracts and expands, opening and closing the pupil, in response to the brightness of surrounding light, helps protect the sensitive retina Pupil: the hole in the center of the iris in which light passes through Retina: is the film of the eye which converts light rays into electrical signals and sends them to the brain through the optic nerve, the sides of the retina are responsible for our peripheral vision (the center area, called the macula, is used for our fine central vision and color vision, the retina is where most the problems leading to vision loss occur) Optic nerve: bundle of more than one million nerve fibers takes the signals gathered by the rods and cones of the retina and transmits them to the brain, where they are translated into the constant stream of images that make up human eyesight Created by: Ummehanie Raja http://science.howstuffworks.com/environmental/life/human-biology/eye2.htm http://www.aoa.org/x6024.xml

Human Eye

Transcript: When you look up, some of this blue light reaches your eyes from all over the sky. Since you see blue light from everywhere overhead, the sky looks blue. The lens, like the lens of a camera, opens and shuts to allow light to reach the retina to focus an image. Rods translate light into monochromic values, everything inbetween black and white wheras cones convert them into color. The retina is the film of the eye. It converts light rays into electrical signals and sends them to the brain through the optic nerve The cornea helps shield the eye from germs and dust. It also focuses light that comes in Pupil- the opening of the eye. The size of the opening is regulated by the iris Iris- pigmented part of the eye (gives people their eye color)

Human eye

Transcript: The Human eye works Somewhat like a digital camera. It lets light in, The amount of light let in is dependent on the lens. It takes the light in and constructs an image which is store it. Basic over view Human eye

human eye

Transcript: People who are farsighted can not see things up close and can only see thing far away. When you are farsighted light enters the eye and focuses behind the retina. How does someone become farsighted Someone becomes farsighted when there eyeball is to short. If you are farsighted it most likely runs in your family, or you could have a rare eye disease. Some symptoms of being farsighted are blurred vison, aching eyes, and headaches. Farsightedness usally starts at an early age. But normal growth usally corrects it. If it does not correct its self you will need contacts ro glasses. pigment colors are magenta, cyan, and yellow. Primary colors are red, green, and blue. THANKS FOR WATCHING :) Farsighted

Human eye

Transcript: Which toy are eye-safe better to aviod. dry eyes also are a symptom of systemie diseases such as lupus rheusmatoid arthritis. Human eye Diseases Human Eye Toy and eye safe The lazy eye is vision development problem in infants and young chidren that can lead to permanent vision loss. Children Vision

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