Information about Accommodation Reflex
The accommodation reflex is a reflex action of the eye, in response to focusing on a near object, then looking at distant object (and vice versa), comprising coordinated changes in vergence, lens shape and pupil size. It is dependent on cranial nerve II (afferent limb of reflex), higher centres and cranial nerve III.
A near object (for example, a computer screen) appears large in the field of vision, and the eye receives light from wide angles. When moving focus from a distant to a near object, the eyes converge. The ciliary muscle contracts making the lens more convex, shortening its focal length. The pupil constricts in order to prevent diverging light rays from hitting the periphery of the retina and resulting in a blurred image.
The retina is a thin layer of neural cells that lines the back of the eyeball of vertebrates and some cephalopods. It is comparable to the film in a camera.
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A near object (for example, a computer screen) appears large in the field of vision, and the eye receives light from wide angles. When moving focus from a distant to a near object, the eyes converge. The ciliary muscle contracts making the lens more convex, shortening its focal length. The pupil constricts in order to prevent diverging light rays from hitting the periphery of the retina and resulting in a blurred image.
See also
External links
ReFLEX is a wireless protocol developed by Motorola which is used for two-way paging. It is based on the one-way FLEX protocol and comes in two variants, ReFLEX25 and ReFLEX50. Later version 2.7 of the ReFLEX protocol was released. Devices compliant with ReFLEX 2.7.
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Eyes are organs of vision that detect light. Different kinds of light-sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors.
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focus, also called an image point, is the point where light rays originating from a point on the object converge [1]. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle.
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Vice Versa
Author F. Anstey
Country United States[1]
Language English
Genre(s) Fantasy novel
Publisher D.
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Author F. Anstey
Country United States[1]
Language English
Genre(s) Fantasy novel
Publisher D.
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A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.[1]
When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image
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When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image
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The lens is a transparent, biconvex (lentil-shaped) structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. Its function is thus similar to a human-made optical lens.
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The pupil (Latin pupilla "little doll" > pupa "doll") is the variable-sized, black circular or slit shaped opening in the center of the iris that regulates the amount of light that enters the eye.
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Optic Nerve may be a reference to:
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- Optic nerve, the anatomical structure;
- Optic Nerve (comic), the comic book series;
- Optic Nerve (1998), the seminal release from the Irish hip hop act known as Exile Eye; or
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afferent neurons--otherwise known as sensory or receptor neurons--carry nerve impulses from receptors or sense organs toward the central nervous system. This is the case vice versa as well. This term can also be used to describe relative connections between structures.
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The oculomotor nerve is the third of twelve paired cranial nerves. It controls most of the eye movements (cranial nerves IV and VI also do some), constriction of the pupil, and holding the eyelid open.
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field of view (also field of vision) is the angular extent of the observable world that is seen at any given moment.
Different animals have different fields of view, depending on the placement of the eyes.
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Different animals have different fields of view, depending on the placement of the eyes.
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Light is electromagnetic radiation of a wavelength that is visible to the eye (visible light). In a scientific context, the word "light" is sometimes used to refer to the entire electromagnetic spectrum.
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The ciliary muscle is a smooth muscle that affects zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing.
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The lens is a transparent, biconvex (lentil-shaped) structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. Its function is thus similar to a human-made optical lens.
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The pupil (Latin pupilla "little doll" > pupa "doll") is the variable-sized, black circular or slit shaped opening in the center of the iris that regulates the amount of light that enters the eye.
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- For the moth genus, see Retina (moth).
The retina is a thin layer of neural cells that lines the back of the eyeball of vertebrates and some cephalopods. It is comparable to the film in a camera.
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The creator of this article, or someone who has substantially contributed to it, may have a conflict of interest regarding its subject matter.
It may require cleanup to comply with Wikipedia's content policies, particularly neutral point of view.
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It may require cleanup to comply with Wikipedia's content policies, particularly neutral point of view.
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The ciliary muscle is a smooth muscle that affects zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing.
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Presbyopia
Classification & external resources
ICD-10 H 52.4
ICD-9 367.40
Presbyopia (Greek word "presbys" (πρέσβυς), meaning "old person") is the eye's diminished ability to focus that occurs with aging.
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Classification & external resources
ICD-10 H 52.4
ICD-9 367.40
Presbyopia (Greek word "presbys" (πρέσβυς), meaning "old person") is the eye's diminished ability to focus that occurs with aging.
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Georgia State University (GSU) is an urban research university in the heart of downtown Atlanta, Georgia, USA. Founded in 1913, it serves over 28,000[1] students, and is one of the University System of Georgia's four research universities.
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Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed
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