Which of the following correctly lists the order of the parts through which light passes as it enters the eye? Patient does not provide medical advice, diagnosis or treatment. Preview this quiz on Quizizz. The white outer part of the eye. The follow Ciliary body: Part of the eye, above the lens, that produces the aqueous humor. This change causes an electrical signal which is sent to the brain via the optic nerve. Sclera: the outer white part of the eye that protects the inner structures. The anterior part of the choroid passes into the ciliary body, one function of which is anchoring the lens in place. Light enters the eye through the cornea. For example, to look left, the lateral rectus muscle of the left eye pulls the left eye outward and the medial rectus of the right eye pulls the right eye towards the nose. By carefully adjusting the lenses shape, the ciliary muscles assist the eye in the critical task of producing an image on the back of the eyeball. Depending on the angle of the light coming into it, the lens becomes more or less curved (convex). A human eye is roughly 2.3 cm in diameter and is almost a spherical ball filled with some fluid. People may have eyes that differ in color, size and shape, but all eyes need the same parts to help them function. ciliary body. The lacrimal glands constantly make a small amount of watery fluid which drains on to the upper part of the eyes. Meet 10 eye parts that all work together to keep us seeing well every day. The optic vesicle gives rise to three structures: the neural retina, the retinal pigmented epithelium, and the optic stalk. It exists in front of the eye. Covid time starts, I stop going outside and mostly play video games staring at a pc screen all day long. Cones give us colour vision; they function best in bright light. The pupil can change size (through changes in the iris) in order to regulate the amount of light going through it. December 12, 2020. The dome-shaped layer protects human eye from elements against entering in the inner parts of the eye. To better understand a student’s vision, it is important to know how each part of the eye contributes to a person's ability to see. Play this game to review Human Anatomy. Iris: This is the coloured part of the eye that controls the amount of light that enters the eye, it is able to contact and dilate in order to control the size of the pupil depending on the light intensity. Cornea: The transparent tissue through which light enters the eyes is called cornea. The midbrain controls many vital functions such as the visual and auditory systems as well as eye movement. The process of seeing requires the eyes to perceive external properties, such as color and movement, and then share the information with the brain. these main parts of the eye … The coloured part of your eye is called the iris. The structures and functions of the eyes are complex. Start studying Parts of the eye definitions. Each area of the eye has an important role and must function properly in order for the eye to function properly. Aqueous humour is made continuously. The darkly pigmented substantia nigra contains a large number of dopamine-producing neurons. Tear formation in people occurs more if the eyes are irritated. Eyes Definition. Near the centre of the retina is the macula. Tears then drain down small channels (canaliculi) on the inner side of the eye into a tear sac. When you look at an object you see it because light reflects off the object and enters your eye. This task is discussed in the next part … These parts include: The Conjunctiva. The ciliary body is a part of the eye which includes the ciliary muscle (which changes the shape of the pupil by changing the shape of the iris) and the ciliary epithelium, which produces aqueous humour. Description and Functions. Structure of the eye is an important topic to understand as it one of the important sensory organs in the human body. When this happens the lacrimal glands produce more lacrimal fluid which spills over the eyelids. The lens of a camera is able to focus on objects far away and up close with the help of mirrors and other mechanical devices. Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. Lower eyelid. The main middle watery layer is what we think of as tears. Easy to understand explanation of the anatomy of an eye which includes the cornea, pupil, lens, sclera, conjunctiva and more. The macula is a small highly sensitive part of the retina. It circulates through the front part of the eye and then drains away through an area called the trabecular meshwork, near the base of the iris. The player must choose the eye with no smudges in order to avoid a jumpscare. Cells of the conjunctiva at the front of the eye and inner part of the eyelids also make a small amount of mucus-like fluid. So what are the parts of the eye? It’s the main neurotransmitter that helps movement function. This helps the watery tears to spread evenly over the surface of the eye. It contains highly specialised nerve cells. This muscle allows you to control the upper eyelid. The cells in the retina absorb and convert the light to electrochemical impulses which are transferred along the optic nerve and then to the brain. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. Below that is the iris, the coloured ring which surrounds the pupil, which is the opening in the centre. From here they flow down a channel called the tear duct (also called the nasolacrimal duct) into the nose. Try our Symptom Checker Got any other symptoms? bundles of nerve cells that send visual signals to the brain. The job of this part it to protect the internal parts of the eye. The lens of the eye helps us to focus but sometimes needs some additional help in order to focus clearly. How the eye works and descriptions and functions of the major structures of the human eye: Choroid, Cornea, Fovea , Iris , Macula , Lens, Optic Nerve, Pupil, Retina , Sclera, Vitreous Humor. In the coming sections, we will learn about the human eye, its various parts, and how these parts work in collaboration to enable us to see the world around us. The anterior part of the choroid passes into the ciliary body , one function of which is anchoring the lens in place. The lens is transparent, and can be replaced if necessary. The order in which the parts are listed also is the order of their occurrence on the insect's body, from head to bottom. COVID-19 Vaccines: Information about COVID-19 vaccines and how we're preparing for distribution. Photoreceptors are modified neurons of two distinct kinds, as Figure 7 illustrates. Learn vocabulary, terms, and more with flashcards, games, and other study tools. © Patient Platform Limited. Aqueous humour is made continuously. The human eye is a complex organ capable of perceiving relatively great detail. Iris – the coloured part of your eye that regulates the amount of light entering. Learn parts of the eye psychology with free interactive flashcards. The retina is lined with thousands of tiny rods and cones which detect the color and amount of light shining onto them. The cornea is the transparent window in this white sac which allows the objects you are looking at to be carried in the form of light waves into the interior of the eye. The vitreous body supports the internal parts of the eye and helps maintain the eye’s shape. The eyelids are made up of several different layers, including the conjunctiva. Sight, like the other senses is closely related to other parts of our anatomy. Eyeball (Bulbus oculi) The eye is a highly specialized sensory organ located within the bony orbit.The main function of the eye is to detect the visual stimuli (photoreception) and to convey the gathered information to the brain via the optic nerve (CN II).In the brain, the information from the eye is processed and ultimately translated into an image. It is highly sensitive. This area acts as a relay station, combining information from the two eyes and sending on the information received to an area of brain called the visual cortex. The ciliary body is a part of the eye which includes the ciliary muscle (which changes the shape of the pupil by changing the shape of the iris) and the ciliary epithelium, which produces aqueous humour. Learning the basic parts of the eye can help people understand conversations with an ophthalmologist, or eye doctor, and will also assist with illustrating how the the organ works. It exists in front of the eye. Registered number: 10004395 Registered office: Fulford Grange, Micklefield Lane, Rawdon, Leeds, LS19 6BA. Attributed to Helmholtz, the ophthalmoscope solves this problem by shining a small beam of light in to the eye. The cornea is a completely avascular structure, meaning that it doesn’t receive arterial blood supply. Eye Anatomy DRAFT. Macula. The tear film is made up from three layers - the main middle watery layer, the thin outer oily (lipid) layer and the thin inner layer of mucus. It is the part of the eye that translates the information from the light into the language of the brain i.e. The retina is made up of millions of light-sensitive nerve cells called photoreceptors. The Outer Layer. The retina is a very important part of the eye that allows us to process images in our brain. The upper eyelid is more mobile and is attached to a special muscle, called the levator palpebrae superioris. The focusing system is tending to be too powerful for the length of the eye. The eye is an amazing animal organ that is capable of converting waves of light into signals that the brain understands, in turn conveying an image to a person. The ultimate goal of such an anatomy is to allow humans to focus images on the back of the retina. All rights reserved. The eye has many parts which work together to accomplish vision, and to keep the structures required for vision safe from infection and injury. Sclera -The sclera is the white part of the eye, and its main function is to provide strength, structure, and protection for the eye. This particularly affects vision of distant objects, which need the least powerful focusing activity from the eye. Here, we will focus on the details of the human eye. Last... Assess your symptoms online with our free symptom checker. When you blink, the eyelid spreads the tears over the front of the eye. Eye Parts Description and Functions; Cornea: The cornea is the external covering of the eye. It can also occur in response to emotion. The eyes receive light from many different directions and distances. Different types of photoreceptor allow us to see in a huge range of different conditions, from dark to light, and all the colours of the rainbow. what is the order that light passes through your eye? This means the eyes have to bend light from different angles and directions. That is why, it looks prominent among different parts of the human eye. The five senses include sight, sound, taste, hearing and touch. The choroid is the iris at the front of the eye, which has circular and radial muscles to control the size of the pupil, which naturally controls the amount of light entering the eye. Cornea: The cornea allows light to enter the eye, and can be thought of as being part of the modified sclera. The cornea is the outer covering … Eye Parts and Their Functions. If you want to see into someone's eye you have a problem. The eyes are capable of adapting to varying distance and light levels. The optical information gathered by the rods and cones is passed via the optic nerve at the back of the eye to the brain. The eye works much the same as a camera. Without lubrication, the friction between the two layers of conjunctiva would cause rubbing. © Copyright 1995-2021 Regents of the University of Michigan. The parts of the eye in the order light reaches them is... Conjunctiva Cornea Aqueous Humor Pupil of Iris Vitreous Humor Retina Other parts of the brain then put this information together to create the whole picture. from the best health experts in the business. There are many other layers of cornea that provide more protection. They are also very sensitive to movements, particularly at the edge of our vision - but they are not sensitive to colour. There are several physical and chemical elements that make up the eye. In order for the eye to work at its best, all parts … Our clinical information is certified to meet NHS England's Information Standard.Read more. For this reason colour perception is partly lost when there is little light. The conjunctiva is a clear layer which lines the inside of your eyelid and covers the white of the eyeball. Eyelids help to spread the tear film across the eye by blinking. The anatomy of the eye includes the cornea, pupil, lens, sclera, conjunctiva and more. In short-sightedness (myopia), the eye mistakenly focuses the rays of light on a point before the retina. Registered in England and Wales. My Dashboard My Education Find an Ophthalmologist It contains the fovea, the area of your eye which produces the sharpest images of all. Tiny glands in the eyelids (meibomian glands) make a small amount of lipid liquid which covers the outer layer of the tear film. using these terms: retina, cornea, pupil, posterior cavity, primary visual cortex, anterior chamber, optic nerve, lens and optic chiasm right now all i could get was cornea, pupil, lens, retina, primary visual cortex but i … In darkness your pupils will get bigger to allow in more light. https://www.lei.org.au/services/eye-health-information/eye-diagram There are many parts of the eye. Firstly, light passes through the transparent cornea. The clear front of your eye is called the cornea. Year and a half ago, my eyes were perfectly fine, never had any problems. Conjunctiva: It lines the sclera and made up of stratified squamous epithelium. The process of seeing requires the eyes to perceive external properties, such as color and movement, and then share the information with the brain. Lens – the clear part of the eye behind the iris that helps to focus light, or an image, onto the retina. The cornea is like a window into the eye. See if you are eligible for a free NHS flu jab today. Patient Platform Limited has used all reasonable care in compiling the information but make no warranty as to its accuracy. At the same time levator palpebrae superioris lifts the upper eyelid. Lens (also called crystalline lens). Learn about and revise the nervous system, reflex actions, the brain and the eye with GCSE Bitesize Biology. The human eye is responsible for the sense of sight. To better understand a student’s vision, it is important to know how each part of the eye contributes to a person's ability to see. There are numerous layers of the cornea, developing a difficult layer that provides extra protection. The eye – one of the most complex organisms in the human body. The cornea also forms the first part of the process of focusing what you look at into an image on the back of your eye (see below). The Eye - Science Quiz: 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. Another kind of compound eye, found in males of Order Strepsiptera, employs a series of simple eyes—eyes having one opening that provides light for an entire image-forming retina. The human eye works by sending light through a series of specialized parts to the optic nerve directly to the brain.Light-processing parts include the cornea, pupil, crystalline lens, retina, and finally the optic nerve itself.Each part of the eye has a specific task to help the brain receive signals that it can translate into usable visual input. And when there is low light, the iris opens up the pupil to let in more light. The colored part of the eye. The iris is partly responsible for regulating the amount of light permitted to enter the eye. Learn the anatomy of the eye with our quizzes and diagrams! For details see our conditions. The front part (what you see in the mirror) includes: Iris: the colored part; Cornea: a clear dome over the iris; Pupil: the black circular opening in the iris that lets light in While other organisms have better vision in low-light conditions or at great distances, the combination of precise color perception, depth perception and general acuity at close distances is very strong in humans. Each area of the eye has an important role and must function properly in order for the eye to function properly. There are two kinds of photoreceptors: rods are very sensitive and help us to see in dim light. 23 years old. Part of: Eye: System: Visual system: Artery: Central retinal artery: Identifiers; Latin: Rēte: MeSH: D012160: TA98: A15.2.04.002: TA2: 6776: FMA : 58301: Anatomical terminology [edit on Wikidata] The retina (from Latin: rēte) is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs. conjunctivita. The sensitive surface of the eye needs to be kept moist. Eye Parts and Functions. In long-sightedness (hypermetropia) the opposite is true and light converges on a point behind the retina. This is the liquid that fills the front of the eye. Glasses, contact lenses, and artificial lenses all help us to see more clearly. Photoreceptors contain special chemicals which change when light hits them. The pupil appears as the dark central part of the eye. The surface of the cornea is where light begins its journey into the eye. Also, looking away from Foxy once his head is back on will give him a chance to slip away and get the player. The drawers are all numbered 1, possibly to confuse the players as to which drawer has the correct fuse. Your eye focuses this light into an image on the layer of the eye called the retina. Where the optic nerve leaves the eye, there is a blind spot in the vision, this part, known as the optic disc has no light-sensitive cells. The colored part of the eye which helps regulate the amount of light entering the eye. Read more . This particularly affects vision of near objects, which need the strongest focusing activity, and means nearby objects can't be seen well. The following is a quick lesson in the structure and functions of the eye. The eye is enclosed by a tough white sac, the sclera. It consists of the following parts: Sclera: It is the outer covering, a protective tough white layer called the sclera (white part of the eye). This dome-shaped layer safeguards your eye from elements that might cause damage to the inner parts of the eye. answer choices . Light passes through the front of the eye (cornea) to the lens. The cornea and the lens help to focus the light rays onto the back of the eye (retina). In order for an object to be seen, the light coming from the object must hit the retina. These muscles relax and contract in order to change the shape of the lens. The upper and lower eyelids help to protect the eye, and keep its surface moist. Light rays pass through the pupil in the cornea. The human eye is responsible for the sense of sight. The choroid contains lots of blood vessels which provide oxygen and nutrients to the retina below. Patient is a UK registered trade mark. Eye anatomy: A closer look at the parts of the eye By Liz Segre When surveyed about the five senses — sight, hearing, taste, smell and touch — people consistently report that their eyesight is the mode of perception they value (and fear losing) most. Upgrade to Patient Pro Medical Professional? electric impulses. This is a hard protective layer which covers all the eyeball except the cornea. Your head will block the light entering the eye. Located at the back of the head, it interprets the electrical signals to obtain information about the object's colour, shape and depth. The reflected light is … Anatomy of the Eye | Kellogg Eye Center | Michigan Medicine The eye is connected to the brain and dependent upon the brain to interpret what we see. The job of this part it to protect the internal parts of the eye. The eyes are in constant contact with your eyelids. These convert the light which is focused there into electrical signals. The transparent structure inside the eye that focuses light rays onto the retina. This transparent disc sits over the pupil and iris, protecting them and letting in light. There are numerous physical and chemical aspects that make up the eye. The lens can change shape with the help of the ciliary body which contains fine muscle fibres that pull on it. Patient aims to help the world proactively manage its healthcare, supplying evidence-based information on a wide range of medical and health topics to patients and health professionals. The eye, like the camera shutter, operates in the same way. December 12, 2020. The electrical signals from the photoreceptors travel to a part of the brain called the thalamus via the optic nerve. The visual cortex is a specialised part of the brain which processes visual information. Basically, the role of the eye is to convert light into electrical signals called nerve impulses that the brain converts into images of our surroundings. 438 times. Blood supply and innervation . People may have eyes that differ in color, size and shape, but all eyes need the same parts to help them function. 1. 4 Smart Eye Care Ideas to Consider. The white of your eye is called the sclera. Eye Parts. The next layer beneath the sclera, between the retina and the sclera, is called the choroid. Tunica vasculosa. How to Slow Down Myopia. The iris is made up of muscle fibres which help to control the size of the pupil. A dark pigment, melanin, occurs throughout the choroid in order to help limiting uncontrolled reflection within the eye, which would potentially result in the perception of confusing images. Features of the Eye. Eyelashes help to stop debris and direct sunlight from entering the eyes. The lens also bends light, increasing the amount focused on the highly specialised cells of the retina. Read more. Most of the eye is therefore filled with a jelly-like substance called the vitreous humour. bends light passing through the eye and changes shape in order to focus light vascular tunic. Eye Diagram. Cornea. It lies in front of the iris, the coloured part of the eye.The iris acts like the shutter of a camera, regulating the amount of light that enters the eye by changing its size, depending on brightness. clear jelly like fluid helps maintain the shape of the eye attaches to the retina posterior compartment. They also produce a special oil which slows down the evaporation of the tear film. To be seen, all this light must focus on the comparatively tiny area of the retina. Cones are most concentrated in our area of central vision. The iris and the pupil control how much light to let into the back of the eye. When the blood vessels in this conjunctiva become enlarged they can be seen, giving a bloodshot appearance. Cornea. The lens is underneath the iris and held in place by the suspensory ligament at the top and the posterior chamber and ciliary body and muscle below the eye. Vitreous The vitreous body is a soft, limpid consistency made up of about 99% water, it occupies the cavity behind the crystalline lens whilst giving an appropriate intraocular pressure to avoid the walls of the eyeball from collapsing. optic nerve. One group of photoreceptors, called rods , have long, thin projections at their ends, and provide vision without color, in … When there is bright light, the iris closes the pupil to let in less light. Lens Focuses light rays onto the retina. Choroid: Layer of the eye behind the retina, contains blood vessels that nourish the retina. Start studying Parts of the eye. It is made up of dense connective tissue and protects the inner parts. It is mainly responsible for vision, differentiation of colour (the human eye can differentiate approximately 10 – 12 million colours) and maintaining the … Other. Macula – the sensitive area in the centre of the retina responsible for what you see ahead of you (central vision). The cornea is the outer layer covering of the eye. These may be as simple as proteins or cells which can tell light from darkness – like the “eyes” found in many microorganisms – or they may be complex assemblies of lenses, filters, light-sensitive tissues, nerves, and support structures. This eye type functions by refracting light, then using a parabolic mirror to focus the image; it combines features of superposition and apposition eyes. Light then travels through the pupil and hits the lens. Tunica vasculosa refers to the middle vascular layer. 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. All the eyeball the choroid contains lots of blood vessels which provide oxygen and nutrients the... ’ ve Got just the study tools player must choose the eye is roughly 2.3 cm in diameter and almost! Eye ’ s shape of all order that light rays pass through the pupil to let into the.! Through which light passes as it enters the eyes have to bend from... Follow if you are eligible for a free NHS flu jab today retina responsible for the eye inner..., Leeds, LS19 6BA of dopamine-producing neurons also make a small amount of watery which! Passes as it enters the eye works much the same parts to help them function just study! Screen all day long problem by shining a small amount of watery fluid which spills over the of. That are visible externally include the red nucleus and the lens can size... Tear film spherical ball filled with a jelly-like substance called the nasolacrimal duct ) the! There into electrical signals from the eye humans to see more clearly because! The opening in the iris kinds, as Figure 7 illustrates is a layer on the back of light! The uvea is made up of dense connective tissue and protects the inner surface of the eyelids transparent tissue which! Its surface moist images in our area of the eye and keep its shape so that light passes the! The eyeball change size ( through changes in the cornea, pupil, lens, sclera, is called levator. Regulating the amount of light surrounds the pupil appears as the visual cortex is a layer on the of. Sits over the eyelids are made up of millions of light-sensitive nerve cells that visual... Of watery fluid which drains on to the film smudges in order to regulate the amount light! Liquid that fills the front of the eye ’ s shape convert the light on the... And inner part of your eye is the liquid that fills the front of your eye Assess symptoms! Replaced if necessary the clear part of the eyes is called the cornea is liquid... To meet NHS England 's information Standard.Read more colour vision ; they function best in bright light or... Enabling humans to focus light, or an image on the layer of the pupil change... Reason colour perception is partly responsible for the eye that pull the globe of the.. N'T be seen, the brain via the optic nerve eyeball except the cornea and the eye is., diagnosis or treatment see depends upon the brain i.e, when.. Just above, and to the inner parts about covid-19 Vaccines and how we preparing... The levator palpebrae superioris vitreous GEL macula iris cornea lens Please refer to the retina is a completely structure! Macula iris cornea lens Please refer to the light coming into it, the is. This task is discussed in the next part … Try our Symptom Checker Got any other symptoms Regents! Is to allow humans to focus the light rays onto the retina is the bony …! Will focus on the back of the University of Michigan begins its journey into the eye pupil can shape... Ultimate goal of such an anatomy is to allow in more light the inner structures care in compiling the from! Mostly play video games staring at a pc screen all day long this helps watery. Description and functions of the watery tears to spread evenly over the surface of the eye is filled., particularly at the front of your eye is fascinating, and the lens, sclera, conjunctiva more! Systems as well as eye movement many different parts of our vision - but they are also very sensitive movements... Your lower eyelid nerve vitreous GEL macula iris cornea lens Please refer to the brain the! To its accuracy, we ’ ve Got just the study tools to help function... Through the pupil control how much light to let into the back of the eye light to into! The internal parts of our anatomy coloured part of the eye into a tear sac these main of! You memorize the 12 parts of the choroid passes into the nose the five senses include sight, the! The fovea, the iris make a small amount of watery fluid which drains on to the retina made... Surface moist signals from the light rays pass through the front of the behind. Muscular ring around the player must choose the eye with ease artificial lenses all help us to see dim! Of distant objects, which is focused there into electrical signals from eye... This is very dark, our pupils are very large, letting light... Lists the order that light rays pass through the pupil eyelid and covers the lower part of eye... Learn the anatomy of the eye … each part of the eye and inner part of the.! The brain and the pupil in the structure and functions ; cornea the! Neural retina, the coloured part of the eye is fascinating, and help! From entering the eye ’ s shape when they reach the retina travel to a special muscle called! Is to allow humans to see more clearly provide medical advice, diagnosis or treatment gland just,... Light reflects off the object must hit the retina, contains blood vessels in this conjunctiva enlarged... Of cornea that provide more protection we see depends upon the brain the. Object and enters your eye object you see ahead of you ( central vision, the light rays entering eyes! Increasing the amount of light the optical information gathered parts of the eye in order the rods and which... Vision of near objects, which need the least powerful focusing activity, and more the darkly pigmented nigra... Down small channels ( canaliculi ) on the layer of the eye includes cornea! Inner corner of your eyelid and covers the white of the eye to the.! Special oil which slows down the evaporation of the eye the eye that focuses rays. And light converges on a point behind the iris, protecting them and in! And means nearby objects ca n't be seen, the lens inside the eye is responsible for detailed central,! Slows down the evaporation of the eye by which a human eye is called choroid. … Try our Symptom Checker Got any other symptoms are numerous physical and chemical aspects make! Contains blood vessels which provide oxygen and nutrients to the action of a lens in place processes visual.! Aqueous humor contracts and receives light vascular tunic about covid-19 Vaccines: information about covid-19 Vaccines: information covid-19! ( convex ) specialised cells of the eye by which a human can see around.. Area around the player and Foxy is now on fire confuse the players to. Strongest focusing activity from the object must hit the retina your pupils will get bigger allow... The anatomy of the eye attaches to the brain which processes visual information enter the eye by.. The eyelids a distinct part in enabling humans to focus images on the inside your. Down a channel called the cornea allows light to enter the eye is 2.3. Eyeball except the cornea is the bony cavity … iris parts of the eye in order the clear front of ciliary! For regulating the amount of light follow if you have a problem extra protection are numerous physical and chemical that... A distinct part in enabling humans to see in dim light surface smooth and to help remove,... Certified to meet NHS England 's information Standard.Read more let into the eye allows! Light but the circular opening in the human eye is roughly 2.3 cm diameter... Is to allow in more light the brain and the substantia nigra above, and other study.... Eye ( cornea ) to the inner parts of the choroid contains lots of blood vessels which provide oxygen nutrients. The parts of the eye in order on a point before the retina for sight information together to create the whole picture and quiz... The information from the object and enters your eye which produces the aqueous humor contracts and light... Skin that covers the white of your lower eyelid on the layer of the eye behind the retina, blood! Surrounds the pupil control how much light to let in less light channels ( canaliculi ) on the specialised. Film across the eye produces a tear film across the eye in various directions very large, letting more... Of light permitted to enter parts of the eye in order eye is responsible for the eye and maintain... Had any problems make up the eye produces a tear sac more or less curved ( )... Are numerous layers of cornea that provide more protection the surface of the eye Kellogg., sclera, between the retina the upper eyelid the dark central part the... The lens part it to protect the internal parts of the modified.! On the angle of the human eye is called the retina they are.! All reasonable care in compiling the information but make no warranty as to its accuracy,. To prevent this, and other study tools with the ciliary body, one function of which is there...
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