achromatic vision definition
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- Achromatic means literally “without color”. It can also refer to: Achromatic colors, “greys” or “neutral colors”, also black. Achromatic lens, a lens designed to minimize chromatic aberration. Achromatic vision: Monochromacy (total color blindness) Achromatopsia. Monochrome.
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- Full Definition of TUNNEL VISION. 1. : constriction of the visual field resulting in loss of peripheral vision. 2. : extreme narrowness of viewpoint: narrow-mindedness; also: single-minded concentration on one objective.— tun·nel–vi·sioned \-ˈvi-zhənd\ adjective.ull Definition of TUNNEL VISION. 1. : constriction of the visual field resulting in loss of peripheral vision. 2. : extreme narrowness of viewpoint: narrow-mindedness; also: single-minded concentration on one objective.
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Limited and Unlimited Government A government in which everyone, including those in authority, must obey the laws. This is common in Western culture. The U.S. constitution is a document that is an example of limiting the power of government. Unlimited government A government in which no limits are imposed on the ruler's authority.
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Tunnel vision Tunnel vision. For other uses, see Tunnel vision (disambiguation). Tunnel vision (also known as Kalnienk vision) is the loss of peripheral vision with retention of central vision, resulting in a constricted circular tunnel-like field of vision. Contents.
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How policies matter; Haiti and the Dominican Republic How policies matter; Haiti and the Dominican Republic. The border between Haiti and the Dominican Republic, James P Blair/National Geographic, 2009. This image is pretty famous. It’s a picture of the border between Haiti, on the left, and the Dominican Republic, on the right.It’s also one of the reasons I think environmental policy is so cool – look at the difference valuing forests can make in the long run!his image is pretty famous. It’s a picture of the border between Haiti, on the left, and the Dominican Republic, on the right. It’s also one of the reasons I think environmental policy is so cool – look at the difference valuing forests can make in the long run!
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Achromatopsia Symptoms and Causes These symptoms may include blurred vision, nystagmus (involuntary eye movements, such as shaking or wobbling), or photophobia, which is a heightened sensitivity to light that may cause discomfort or pain. Achromatopsia is considered a non-progressive disorder, meaning symptoms do not become more severe over time.
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orthoptics orthoptics (ɔːˈθɒptɪks) n (Medicine) (functioning as singular) the science or practice of correcting defective vision, as by exercises to strengthen weak eye muscles. orthoptics the art of treating visual defects by exercise and retraining in Visual habits. — orthoptist, n. — orthoptic, adj.
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- tunnel vision. a drastically narrowed field of vision, as in looking through a tube, symptomatic of retinitis pigmentosa. an extremely narrow or prejudiced outlook; narrow-mindedness.
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- Anisometropia (/aenˌaɪsəmɨˈtroʊpiə/. ænˌaɪsəmɨˈtroʊpiə·an′·ī·sə·mə′·trō·pē) ə is the condition in which the two eyes have unequal refractive. Power each eye can be (nearsighted), myopia (farsighted) hyperopia or a combination of, both which is called. antimetropia
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Surgery For Presbyopia In a monovision technique called NearVision CK (Refractec), conductive keratoplasty is performed on one eye only  usually the non-dominant eye  to correct presbyopia in a person who can see well in the distance without glasses or contact lenses, but who needs help with near vision.
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Amblyopia (Lazy Eye) On this page: Causes of lazy eye • Amblyopia treatment • Older children and adults with lazy eye. Amblyopia, also known as lazy eye, is a vision development disorder in which an eye fails to achieve normal visual acuity, even with prescription eyeglasses or contact lenses. Amblyopia begins during infancy and early childhood. In most cases, only one eye is affected.
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Our Readers Want to Know: What Is the Difference Between Low Vision and Legal Blindness? Visual acuity is a number that indicates the sharpness or clarity of vision. A visual acuity measurement of 20/70 means that a person with 20/70 vision who is 20 feet from an eye chart sees what a person with unimpaired (or 20/20) vision can see from 70 feet away.
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- Define Optic atrophy. Optic atrophy synonyms, Optic atrophy pronunciation, Optic atrophy translation, English dictionary definition of Optic atrophy. n. 1. An artificial waterway or artificially improved river used for travel, shipping, or irrigation. 2. Anatomy A tube, duct, or passageway. 3.
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Binocular Vision Anomalous - Binocular Single vision is anomalous when the images of the fixated object are projected from the fovea of one eye and an extrafoveal area of the other eye i.e. when the visual direction of the retinal elements has changed.
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- Tunnel vision occurs when one loses visual acuity in the peripheral visual fields while retaining visual acuity in the central regions. The vision can be considered to be constricted and concentrated in the central area, as when one is inside a tunnel looking out.
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Field of view Horizontal Field of View. Vertical Field of View. Angle of view can be measured. horizontally, vertically, or diagonally. From Wikipedia, the free encyclopedia. The field of view (also field of vision, abbreviated. FOV) is the extent of the observable world that is. seen at any given moment. In case of optical.
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- Vision Therapy Vancouver. Hypertropia. Hypertropia, commonly called vertical strabismus, wandering eye or wall-eye, is the visual condition in which a person uses only one eye to look at an object while the other eye turns upward. Hypertropia is one of several types of strabismus, a condition resulting in eye turns or deviating eyes.
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Anisometropia Anisometropia is the condition in which the two eyes have unequal refractive power. Each eye can be nearsighted (myopia), farsighted (hyperopia) or a combination of both, which is called antimetropia. Generally a difference in power of two diopters or more is the accepted threshold to label the condition anisometropia.
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Free Astigmatism Test - Online Test for Astigmatism Astigmatism is a condition of impaired eye sight which is a result of an irregular curvature of the cornea or lens. Blurred vision is the main symptom of astigmatism. Astigmatism is a curable eye condition and may be corrected with eyeglasses, contact lenses, or LASIK surgery.
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- Colenbrander – History of Visual Acuity Measurement. The Historical Evolution of Visual Acuity Measurement. August Colenbrander, MD – San Francisco. Presented at the 2001 Meeting of the. Cogan Society for Ophthalmic History. Today I would like to speak not so much about a single historical individual, as about the.
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Achromatopsia Symptoms and Causes Achromatopsia is the inability to see color. In the most severe form of the disease, called complete achromatopsia, the patient cannot see any color at all. Incomplete achromatopsia is a milder form of the disease where the patient has impaired ability to see color rather than a complete loss of color vision.
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Astigmatism Symptoms, Diagnosis, and Treatment Astigmatism is a vision problem that causes objects to appear distorted and blurry. It often affects both distance and near vision. It is the most common vision problem and it may occur with nearsightedness and farsightedness. Astigmatism usually causes vision to be blurry at distance as well as near.
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- To correct for chromatic aberration, two lenses can be used in the objective. A two-lens objective is called a doublet. Each piece of glass has different optical properties, allowing chromatic aberration to be minimized (but not eliminated). This type of objective is termed achromatic.
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Orthoptist Orthoptist. Orthoptics is a branch of ophthalmology that deals with the alignment and proper movement of the eyes. An orthoptist evaluates patients who have vision disorders, like lazy eye or strabismus. Learn more about education and employment information here.t is the job of professional orthoptists to recognize these disorders. Though orthoptics is a small portion of the eye care field, orthopotic professionals work closely with ophthalmologists to develop treatment plans that could include surgery or orthoptic therapy.
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amblyopia ex anopsia sup·pres·sion am·bly·o·pi·a. 1  suppression of the central vision in one eye when the images from the two eyes are so different that they cannot be fused into one. 2  Synonym(s): amblyopia ex anopsia. Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. Related to amblyopia ex anopsia: lazy eye. sup·pres·sion am·bly·o·pi·a. suppression of the central vision in one eye when the images from the two eyes are so different that they cannot be fused into one.
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anophthalmos anophthalmos (an´opthal´məs), n a congenital absence of all tissues of the eyes. anophthalmia, anophthalmos. a developmental anomaly marked by complete absence of one or both eyes or the presence of rudimentary eyes. Occurs most commonly in pigs and sheep.