Parts of the human eye pdf

The transparent tissue through which light enters the eyes is called cornea. The cornea is the clear, outer part of the eye s focusing system located at the front of the eye. Now stare at the red dot with your right eye from 12 inches, covering your left eye with your left hand. It contains a central part, where the resolution is maximized, which is a small area called the fovea and which has a diameter of 1. Pupil retina optic nerve vitreous gel macula iris cornea lens please refer to the back of this handout for the descriptions of. This light enters the eye through the cornea, which acts like a window at the front of the eye. The opening at the front of the eye through which light passes. The lenss job is to bend light and focus the image onto the retina. The function of iris is to control the diameter and size of the pupil and thus the. Human eye is the most valuable and sensitive sense organ. The pupil is the dark circle inside the center of the eye.

The iris, a pigmented diaphragm with an aperture pupil in its center, controls the amount of light entering the eye. The aperture size refers to how much light is let into the camera and will ultimately hit the sensor or film. Because of this, the functional principles of these devices cannot be fully understood without an understanding of basic optics of the human eye. Learn parts of the human eye anatomy with free interactive flashcards. The different parts of the eye allow the body to take in light and perceive objects around us in the proper. The aqueous humor is between the cornea and the iris. Choose from 500 different sets of parts of the human eye flashcards on quizlet. The human eye is an organ that reacts to light and allows vision. The amount of light entering the eye is controlled by the pupil, which is surrounded by the iris the coloured part of the eye because the front part of the eye is curved, it bends the light, creating an upside down. A person can view some of the parts of the human eye by looking into a mirror. These muscles move the eye up and down and side to side, and rotate the eye. Retina the retina is the area at the back of the eye that receives the refined, visual message from the front of the eye, and it transmits that visual message to the brain using electrical signals.

Six extraocular muscles in the orbit are attached to the eye. The human eye can differentiate between about 10 million colors and is possibly capable of detecting a single photon. Choose from 500 different sets of parts of the human eye anatomy flashcards on quizlet. Parts of the eye american academy of ophthalmology. The changes light the eye receives into nerve signals. Students are also asked to correctly label the parts of the human eye, demonstrating their understanding of the lesson material. Our eyes are highly specialized organs that take in the light reflected off our surroundings and transform it into electrical impulses to send to the brain. Both share similar functions, according to kellogg eye center at the university of michigan. The eye sits in a protective bony socket called the orbit. A clear covering around the front of the eye that serves as protec2on for the pupil and iris.

There are 6 sets of muscles attached to outer surface of eye ball which helps to rotate it in different direction. The human eye, continued the back of the eye is like a movie screen for the images you see. The human body is an amazing structure which contains a wide range of complex parts and processes. This is a strong layer of tissue that covers nearly the entire. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. Light enters our eyes through the pupil, then passes through a lens and the fluidfilled vitreous. Included is a worksheet to help students learn about the human eye and how we. The aperture is to the camera as the iris is to the eye, and this reveals one of many similarities between cameras vs. The eyeball is nearly spherical in shape with a diameter of about 2. Structure and functions of human eye with labelled diagram. The structure of the human eye is analogous to that of a camera.

The carries nerve signals from the eye to the brain. The human eye the reason people can see words on paper, the sunrise in the morning, or the bright light of the moon at night, it is because of the human eyes. Differences between human eye and camera healthfully. The iris is the colored part of the eye that surrounds the pupil. There are about 120 million rods and about 7 million cones in each eye. An intro to the functioning and disorders of the human eye. The cornea, a transparent front part of the eye, transmits most laser wavelengths except for farultraviolet and farinfrared radiation. It is important because it controls the size of the pupil. Iris like the diaphragm of a camera it controls the amount of light entering. The anatomy of the eye includes auxillary structures, such as the bony eye socket and extraocular muscles, as well as the structures of the eye itself, such as the lens and the retina. The job of this part it to protect the internal parts of the eye. The following parts of the eye are important with regard to laser effects.

Human eye anatomy parts of the eye and structure of the. Webmds eyes anatomy pages provide a detailed picture and definition of the human eyes. The eye is one of the most complex parts of the body. Learn parts of the human eye with free interactive flashcards. Move your left hand to unblock your left eye and the gap reappears. During this lesson, students are asked to engage in peer learning by working in pairs and sharing observations with the class. Is the transparent, curved front of the eye which helps to converge the light rays which enter the eye sclera is an opaque, fibrous, protective outer structure. There are several advantages of our having two eyes instead of one. Human eye presentation free download as powerpoint presentation. The images we see are made up of light reflected from the objects we look at.

The human eye, the organ containing visual receptors, provides vision, with the assistance of accessory organs. As with the human eye, when the iris contracts itself, the pupil becomes smaller and the eye takes in less light. These accessory organs include the eyelids and lacrimal apparatus, which protect the eye, and a set of extrinsic muscles, which move the eye. Parts of the eye and their functions there are numerous physical and chemical aspects that make up the eye. Parts of human eye and their functions understanding the different parts of our eye can help you understand how you see and what you can do to help keep the eye functioning properly. Eyes structure and function the eye transmits visual stimuli to the brain for interpretation and, in doing so, functions as the organ of vision. The anatomy of the eye is fascinating, and this quiz game will help you memorize the 12 parts of the eye with ease. Light enters through the cornea, the transparent outer covering of the eye. Our the human eye lesson plan introduces students to the parts and functions of the human eye. The human eye facts, functions, structure and problems. The fluid beneath the cornea has a composition similar to that of blood plasma. The knowledge of eye parts and functions is both useful and interesting. Behind the lens, the light passes through the vitreous humor and is received at the retina where the detection of light takes place. The camera and the human eye both process light and record images.

Rods cannot sense things in color, but they can see black and white and different shades of gray. Rods and cones are two different types of cells found in the retina. Then list all the jobsactivities and protective gear on the board. The retina is made up of very specialized cells called rods and cones. Notice that the gap in the blue bar fills in completes. Notice that the retinas blood supply comes in through the center of the optic nerve. Sclera the sclera is the white part of the eye, and its main function is to provide strength, structure, and protection for the eye. It is the coloured part of the eye and opens and closes around a central hole to control the light entering the eye.

It is soft connective tissue, and the spherical shape of the eye is maintained by the pressure of the liquid inside. The eye, lacrimal gland, and associated extrinsic muscles are housed in the orbital cavity. The human eye and the colourful world 189 why do we have two eyes for vision and not just one. It provides attachment surfaces for eye muscles choroid. The eye is situated inside a hollow area of the skull called the eye socket. Use the model to demonstrate the various parts of the eye to the class, using the above diagram fig. See well for a lifetime parts of the eye to understand eye problems, it helps to know the different parts that make up the eye and the functions of these parts. The extraocular muscles are attached to the white part of the eye called the sclera. A human being has a horizontal field of view of about 150 with one eye and of about 180 with two eyes. The transparent bump in the front of the eye is the. Learn about their function and problems that can affect the eyes.

The front transparent part of the sclera is called cornea. It is the outer covering, a protective tough white layer called the sclera white part of the eye. Human eye presentation human eye cornea free 30day. Although many of the parts of the eye and camera are comparable, certain aspects of the mechanisms of each operate differently. Light travels through the cornea, aqueous humor, pupil, lens and vitreous humor. The iris is a slim, circular structure in the eye that lies between the cornea and the lens of the human eye. Visit an eye care unit or clinic with your friends and teacher to. Human eye, specialized sense organ in humans that is capable of receiving visual images, which are relayed to the brain. A muscle called the zonula controls both the shape and positioning forward and backwards of the eye s lens. The eyeball is located in the eye orbit, a round, bony hollow formed by several different bones of the skull. Human eye definition, structure, function, parts, diagram.