what is pupil
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Pupil (eye) Pupil (eye) The pupil is the opening in the centre of the eye. Light enters through the pupil and goes through the lens, which focuses the image on the retina. The size of the pupil is controlled by muscles. There is a circular group, which squeezes the iris smaller, and another group which pulls the iris wider. When more light is needed, the pupil is made larger. In brighter light, the pupil is made smaller.
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About the Eye and How It Works The iris is a tissue inside the eye that has a hole in the center called the pupil. The iris contains muscles that allow the pupil to become larger (open up or dilate) and smaller (close up or constrict).n dim light, the iris opens (or dilates) and makes the pupil opening larger to increase the amount of light that enters your eye: The iris in dim light. In addition, it is the iris that determines your eye color.
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pupil Pupil. the opening in the iris through which light rays enter the eye. The dimensions of the pupil change according to the amount of light present: the pupil dilates in darkness, under emotional excitement and painful sensations, or with the injection of atropine or adrenalin into the body; it contracts in bright light.
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The Pupil In the case of the eye, most of the emotion is conveyed by the eyelids - they narrow when we concentrate and open wide when we are amazed. The eye itself has only one part that changes in a manner that is visible to others and that is the pupil. The pupil is the circular opening in the middle of the iris. It opens and closes to control the amount of light that is allowed to enter the eye. This light is then focused on the retina, which is the layer of light sensitive cells at the back of the eye.
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Your pupil changes size to control how much light enters your eye. Search form. Pupil. Your pupil changes size to control how much light enters your eye. You can watch the pupil of your eye change size in response to changes in lighting. You can also experiment to determine how light shining in one eye affects the size of the pupil in your other eye.
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IRIS pupil. see eye eye,organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other..... Click the link for more information.
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Pupilometer In the most common sense, a pupilometer is a tool for measuring pupillary distance (PD). It is used for fitting eyeglasses so that the lenses are centered in the visual axis. This is the most common nomenclature.
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Extreme Eye Dilation in Cats How the Pupil Works. A cat's pupil is an elliptically-shaped opening in the iris that allows light to pass to the retina. It dilates or constricts according to the amount of light that enters Frisky's eyes.If she's in a dim room with little light, her pupils will be large in order to take in more light for improved vision.ow the Pupil Works. A cat's pupil is an elliptically-shaped opening in the iris that allows light to pass to the retina. It dilates or constricts according to the amount of light that enters Frisky's eyes.
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The Eyes and Vision The pupil appears as the dark central part of the eye. The pupil can change size (through changes in the iris) in order to regulate the amount of light going through it. In darkness your pupils will get bigger to allow in more light. The retina is a layer on the inside of the back of the eyeball.
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Dilation of the Pupil for Eye Examination The process of administering special pharmaceutical eye drops into the eyes in order to enlarge the pupils. Dilating the pupil facilitates the view of the internal structures of the eye including the lens, optic nerve, blood vessels and retinal in greater detail. Dilation is a key component of a comprehensive eye examination, as it sometimes leads to the detection and diagnosis of certain eye diseases.
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Pupil Size and Your Health Answer: Pupil size can tell a doctor a lot about your health. Pupil size is an important key to unlocking possible medical problems inside your body. The pupil is the round black circle in the center of the iris, the colored part of your eye. The pupil is actually a hole through which light passes to the retina, the light-sensitive layer in the back part of the eye.
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eye eye. 1. The organ of the body with which an animal is able to see or sense light. In vertebrate animals, the eye occurs as one of a pair, each consisting of a spherical structure that is filled with fluid. Incoming light is refracted by the cornea and transmitted through the pupil to the lens, which focuses the image onto the retina. See more at compound eye, eyespot.
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Why pupil is black? In optical terms, the anatomical pupil is the eye's aperture and the iris is the aperture stop. The image of the pupil as seen from outside the eye is the entrance pupil, which does not exactly correspond to the location and size of the physical pupil because it is magnified by the cornea.
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What is Pupillary Distance (PD)? Pupillary distance (PD) is the measurement (in millimeters) of the distance between the pupils of your eyes. Pupillary distance is an important measurement used to determine the proper lens shape and alignment of your prescription correction to your line of vision.
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- Pupillary response. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve. This response results in either constriction (miosis), narrowing the pupil, or dilation (mydriasis), widening the pupil.upillary response. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve. This response results in either constriction (miosis), narrowing the pupil, or dilation (mydriasis), widening the pupil.
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What is my Pupil Distance (Pupillary Distance or PD)? What is my Pupil Distance (Pupillary Distance or PD)? The Pupil Distance or otherwise known as Pupillary Distance (PD) is the distance between your two pupils, measured in millimeters (mm). This measurement is required for us to center the lenses correctly in the glasses/goggles so that you are looking through the center of the lenses.
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- pupillary reflex-reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller.
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What Does It Mean When a Dog's Pupils Are Different Sizes? Apple Tree House/Lifesize/Getty Images. The pupil is the round hole in the middle of each eye that constricts or dilates in response to the amount of light present. Your dog’s pupils should normally constrict (grow smaller) in bright light and dilate (grow larger) in dim light. Anisocoria is the word used to describe unequal pupil size between the two eyes, and can be caused by a number of conditions.
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Pupil The iris is a contractile structure, consisting mainly of smooth muscle, surrounding the pupil. Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil.he iris is a contractile structure, consisting mainly of smooth muscle, surrounding the pupil. Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil.
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Pupil The iris is a contractile structure, consisting mainly of smooth muscle, surrounding the pupil. Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil.hen this muscle contracts, it reduces the size of the pupil. This is the pupillary light reflex, which is an important test of brainstem function. Furthermore, the pupil will dilate if a person sees an object of interest.
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Pupil Size and Your Health Pupil size is an important key to unlocking possible medical problems inside your body. The pupil is the round black circle in the center of the iris, the colored part of your eye. The pupil is actually a hole through which light passes to the retina, the light-sensitive layer in the back part of the eye.
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Pupillary light reflex Pupillary light reflex - Terminology. 1  Pupil is the dark circular opening in the center of the iris and is where light enters the eye. 2  Left direct pupillary reflex is the left pupil's response to light entering the left eye. 3  Left consensual pupillary reflex is the left pupil's indirect response to light entering the right eye, the contralateral eye.
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Medical Definition of Optic nerve The pupil is the dark aperture in the iris that determines how much light is let into the eye. The lens is the transparent structure inside the eye that focuses light rays onto the retina.
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What is the Pupil of the Eye? - Definition & Function The pupil of the eye is the black circle in the center of the iris. The iris is the colored ring in the eye with a color and structure unique to each person. From the outside of the eye, light passes through the clear lens, then through the pupil.
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Cliches One's favorite person; the one you love most. In Old English, the pupil of the eye (the round, dark center) was called the 'apple'. It was thought that the pupil was a round object much like an apple (a piece of fruit). When you look at someone, their reflection appears in your pupil. So if someone is the 'apple of your eye', he or she is someone that you look at a lot and enjoy seeing. 1) Miranda is the apple of my eye-I love her more than anything on earth.
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Definitions &Translations Webster Dictionary(4.00 / 1 vote)Rate this definition: 1  Pupil(noun) the aperture in the iris; the sight, apple, or black of the eye. See the Note under Eye, and Iris. 2  Pupil(noun) a youth or scholar of either sex under the care of an instructor or tutor. 3  Pupil(noun) a person under a guardian; a ward.