Chapter 11 the human eye and the colourful world link of pdf file is given below at the end of the questions list in this pdf file you can see answers of following questions ncert solutions intext questions page no. Sound waves hit the ear drum, causing it to vibrate like a drum. Pdf eye structure and physiological functions researchgate. From the optical point of view, the black central circle, which is the pupil area, and the structured iris diaphragm are the most interesting parts. For a human eye with excellent acuity, the maximum theoretical resolution is 50 cpd 1. In this article we will discuss about the structure of human eye with the help of suitable diagram. The human eye is a very sensitive and delicate organ suspended in the eye socket which protects it from injuries. Notice that the gap in the blue bar fills in completes. Get a printable copy pdf file of the complete article 205k, or click on a page image below to browse page by page. Its function is to help control the amount of light entering the eye so that.
Human eye crossword structure, function and focusing. Choroid a thin, highly vascular membrane between the retina and. The function of iris is to control the diameter and size of. A human being has a horizontal field of view of about 150 with one eye and of about 180 with two eyes. The structure of the eye sclera choroid retina fovea optic nerve arteries and veins cornea iris il aqueous humour ciliary muscle suspensory ligaments. Learn how the human eye works, including the parts of the eye s structure, the functions of each part of the eye, and common vision problems. The eye is a hollow, spherical structure measuring about 2.
These middle ear bones mechanically amplify sound and compensate mismatched impedance. Introductionintroduction the eye is a specialized sense organ that helps us to understand our environment. The human eye facts, functions, structure and problems. As a demonstration for use in a science educational setting, we developed a way to make a variable focal length lens using a lid for food preservation, and constructed a model of the human eye. Cytologyinternal structure of cells histologystudy of tissues groups of cells gross anatomy surface anatomy regional anatomy systemic anatomy. The knowledge of eye parts and functions is both useful and interesting. Types of anatomy microscopic anatomy cytologyinternal structure of cells. There are several advantages of our having two eyes instead of one. The middle vascular coat choroid, ciliary body, iris. In this article we will discuss about the structure of human eye.
The eye has a number of components which include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous cornea. It is the outer covering, a protective tough white layer called the sclera white part of the eye. 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. The eyeball is nearly spherical in shape with a diameter of about 2. Members of the animal kingdom use different strategies to detect light and focus it to form images. The human eye and the colourful world jsunil tutorial. It sets three ossicle bones malleus, incus, stapes into motion, changing acoustic energy to mechanical energy.
Visual system human eye visual perception the aim of this page is to give a brief introduction to the human visual system, and to briefly explain how light is transformed into a. Structure 1 of human eye introduction how many of your family members use spectacles. Because of this, the functional principles of these devices cannot be fully understood without an understanding of basic optics of the human eye. I wasted a ton of money on garbage stop snoring products like mouth guards, throat sprays, lozenges and nasal strips, to name just a few. Now stare at the red dot with your right eye from 12 inches, covering your left eye with your left hand. Powerpoint ppt presentation free to view the human eye parts of the eye eye socket pupil cornea iris eyelashes eyelid sclera. From the optical point of view, the black central circle, which is the pupil area. The human eye is an organ that reacts to light and allows vision. Human eyes and colorful world guess question solved x cbse physics human eyes questions for practice. There are 6 sets of muscles attached to outer surface of eye ball which helps to rotate it in different direction. The front transparent part of the sclera is called cornea.
May 27, 2015 structure of human eye and its working the human eye has been called the most complex organ in our body. Gist of lesson for quick revision by jsunil readdownload. The human eye is one of the most valuable sense organs that enables us to see the world around us. The young, healthy human ear can hear frequencies from 20 to 20,000 cycles per second cps, or hertz hz. It is so central to our way of life that irrational. Human eye definition, structure, function, parts, diagram. The structure of the human eye is analogous to that of a camera. The work of the visual system can be summarized as follows. In the orbit, the eye is surrounded by a cushion of fat. Human eye structure scheme medical vector illustration.
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. 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 human eye and vision the human eye and vision optics of the eye lenses, focusing, etc. Human eye structure scheme royalty free vector image. The eye and brain have internal cav ities perfused by fluids of like composition and under equivalent pressures. Human eye, specialized sense organ in humans that is capable of receiving visual images, which are relayed to the brain. It is present in the form of eyeball in the sockets of our skull. Behind the lens, the light passes through the vitreous humor and is received at the retina where the detection of light takes place. Pdf the human eye is a relatively simple optical instrument that imposes the first performance limits on the visual system. Acoustic energy, in the form of sound waves, passes pinna, ear canal. The eyes interpret size, shape, colour and distance of the. Eyes are the most valuable organ of the human body, which process the images of objects in the vicinity. The human eye can differentiate between about 10 million colors and is possibly capable of detecting a single photon.
Light enters the eye through a small hole called the pupil and is focused on the retina, which is like a camera film. Anatomy and physiology of the human eye wiley online library. Study the diagram that shows the anterior and longitudinal section of the human eye and answer the questions that follow. The eye is one of the most delicate and complex organs in the body. The human eye parts and functions aqueous humor a clear, watery fluid that circulates in the anterior chamber between the cornea and the iris. 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 structure of the eye the structure of the eye biologymad a. It can transform vibrations in the environment into meaningful signals that inform and protect us, allow development of spoken language, bring us the sounds of nature and music and allow us to share the lives of our family members and.
Figure 1 a threedimensional representation of the structures of the human eye. It is mainly responsible for vision, differentiation of colour the human eye can differentiate approximately 10 12 million colours and maintaining the biological clock of the human body. Structure of the eye is essential to understand as it one of the important sensory organs in the human body. Vision is an incredibly complex process that works so well, we never need to give it much thought. Let us study how the human eye uses light and enables us to see objects. The eyeball is located in the eye orbit, a round, bony hollow formed by several different bones of the skull. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. Figure 62 shows most of the major structures of the human eye, including the components of the anterior segment, the protective sclera and the posterior segment described in. The human eye the human eye refractive index of lens different for each wavelength colour cool colours blues appear closer. A muscle called the zonula controls both the shape and positioning forward and backwards of the eyes lens. The front, or anterior, sphere, which is the smaller and more curved of the two, is called the cornea. The human eye and the colourful world jsunil tutorial cbse. What is meant by power of accommodation of the eye. Diabetes and healthy eyes toolkit and website keywords.
Its wall has three distinct layersan outer fibrous layer, a middle vascular layer, and an inner nervous layer. The colored ring of the eye, the iris, controls the amount of light entering the eye. Lets have a glance on the human eye its structure and function. An understanding of the anatomy and physiology of the visual system provides eye care professionals and staff with a valuable tool when meeting their patients needs and expectations. Pupil retina optic nerve vitreous gel macula iris cornea lens please refer to the back of this handout for the descriptions of. The function of iris is to control the diameter and size of the pupil and thus the. Structure and function of the eye structure and function of the eye the human body is sensitive to most electromagnetic radiations. Eyes are the most valuable organ of the human body, which process. If so, share your ppt presentation slides online with. Eye also has a focusing lens, which focuses images from different distances on the retina. The human eye, continued the back of the eye is like a movie screen for the images you see. Pdf eyesight is unquestionably the most important modality of perception that humans possess. Data structures and linear algebradata structures and linear algebra support.
Human eye is the most valuable and sensitive sense organ. The retina is made up of very specialized cells called rods and cones. There are about 120 million rods and about 7 million cones in each eye. Consequently, synthetic materials that are to be used in the eye need to have very special properties. Full text full text is available as a scanned copy of the original print version. Anatomy structure and physiology function is the property of its rightful owner. It is composed of two spheres with different radii, one set into the other figs 11 and 12. Is a pigmented muscular structure consisting of an inner ring of circular muscle and an outer layer of radial muscle. Eye anatomy, eye diagram, cornea, iris, lens, macula, optic nerve, pupil, retina, vitrous gel, diabetic eye disease. Review with students what they learned about the human eye, including its structure e.
The human eye and the colourful world chapter11 you have studied in the pr evious chapter about r efraction of light by lenses. May 29, 2015 structure of the human eye illustrated and explained using a diagram of the. Mar 12, 2012 this feature is not available right now. The cornea is the window of the eye because it is a completely transparent structure. A muscle called the zonula controls both the shape and positioning forward and backwards of the eye s lens. Physiology of the eye detection of light summary of lecture the human eye can be modeled as a.
The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye. When you talk of the human eye structure, they exist in pairs, each one being approximately 2. The human eye and the colourful world 189 why do we have two eyes for vision and not just one. Part 1 basic structure and function of the eye part 2 how we control the amount of light that enters the eye part 3 how we focus on near and far objects part 4 a revision game for you to print out and play learning objectives you need to be able to do. It is composed of two spheres with different radii, one set into the other figs 1. Human eyes are cameratype eyes, which means they work like camera lenses focusing light onto film. Human eyes and colorful world commit to memory x solved ncert. Rods cannot sense things in color, but they can see black and white and different shades of gray.
Basic structure of the eye figure 361 shows a picture of the human eye. The eye is an extremely complex organ comprising myriad structures that work together to provide the sense of sight. National eye institute, national eye health education program subject. The iris is a slim, circular structure in the eye that lies between the cornea and the lens of the human eye.
From the reflected light it can be seen that the front surface of the cornea is smooth and glossy. Human eye anatomy parts of the eye and structure of the. This course is designed to provide eye care staff with a detailed, upclose look at the human eye, and. A free powerpoint ppt presentation displayed as a flash slide show on id. You also studied the nature, position and relative size of images formed by lenses. Move your left hand to unblock your left eye and the gap reappears. Structure of the human eye label the parts of the human eye on the diagram below. The topics discussed include hydrogels, eye anatomy, biomedical polymers, scleral buckling agents, intraocular lenses, ocular drug delivery, ocular environment. The external object is seen like the camera takes the picture of any object. Cbse x question bank human eyes and colorful world. Produced by the ciliary body, the aqueous humor nourishes the cornea and the lens and gives the eye its shape.