definition of hemianopsia
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- Hemianopsia, or hemianopia, is a decreased vision or blindness (anopsia) in half the visual field, usually on one side of the vertical midline. The most common causes of this damage are stroke, brain tumor, and trauma.[1]
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heteronymous hemianopia heteronymous hemianopia. Also found in: Dictionary, Thesaurus. Related to heteronymous hemianopia: bitemporal hemianopsia. het·er·on·y·mous hem·i·an·o·pi·a. attitudinal hemianopia involving the upper field of one eye and the lower field of the other; or a binasal or bitemporal hemianopia.
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- Definition of APHASIA. : loss or impairment of the power to use or comprehend words usually resulting from brain damage. — apha·sic \-zik\ noun or adjective.ADVERTISEMENT. loss or impairment of the power to use or comprehend words usually resulting from brain damage. — apha·sic \-zik\ noun or adjective.
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- esotropia. strabismus in which there is manifest deviation of the visual axis of one eye toward that of the other eye, resulting in diplopia; called also cross-eye and convergent strabismus. adj., adj esotrop´ic. (es'ō-trō'pē-ă),
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Homonymous hemianopsia Homonymous hemianopsia occurs because the right half of the brain has visual pathways for the left hemifield of both eyes, and the left half of the brain has visual pathways for the right hemifield of both eyes. When one of these pathways is damaged, the corresponding visual field is lost.
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Chapter 7 - The optic chiasm Wilbrand's Knee of the primate optic chiasm is an artefact of monocular enucleation. [Show abstract] [Hide abstract] ABSTRACT: The anterior chiasmal syndrome consists of a temporal hemianopia or complete visual field loss in one eye, plus a superior temporal hemianopia in the other eye.
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Medical Definition of Aphakia home / medterms medical dictionary a-z list / aphakia definition Medical Definition of Aphakia Aphakia: Absence or loss of the eye's natural crystalline lens, as after cataract removal. From a-, without + phacos, the Greek word for a lentil bean. The ancients thought (quite correctly) that the lens of the eye was shaped like a lentil bean.
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Hemiplegia Hemiplegia in infants and children is a type of Cerebral Palsy that results from damage to the part (hemisphere) of the brain that controls muscle movements. This damage may occur before, during or shortly after birth. The term hemiplegia means that the paralysis is on one vertical half of the body. A similar medical term, hemiparesis, means a weakness on one side of the body. In children with hemiplegia, the paralysis in the body occurs on the side opposite the affected part of the brain.
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Hemiparesthesia Hemiparesthesia means numbness or other abnormal or impaired sensation that is experienced on only one side of the body. Etymology Greek: hemi (half) + para (beside) + aisthesis (sensation)
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esotropia strabismus in which there is manifest deviation of the visual axis of one eye toward that of the other eye, resulting in diplopia; called also cross-eye and convergent strabismus. adj., adj esotrop´ic.
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Medical Definition of Cerebrovascular accident Medical Definition of Cerebrovascular accident. Cerebrovascular accident: The sudden death of some brain cells due to lack of oxygen when the blood flow to the brain is impaired by blockage or rupture of an artery to the brain. A CVA is also referred to as a stroke. Symptoms of a stroke depend on the area of the brain affected.
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Is Meningitis Contagious? In short, most bacterial meningitis infections are mildly to moderately contagious person to person, while some viral meningitis are contagious but other types are not. Fungal, parasitic, and noninfectious causes of meningitis are not contagious from one person directly to another.
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Far-sightedness [edit on Wikidata] Far-sightedness, also known as hyperopia, is a condition of the eye where light focuses behind, instead of on, the retina. This causes close objects to be blurry while far objects may appear normal. As the disease worsens objects at all distances may be blurry. Other symptoms may include headaches and eye strain.
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hemianopsia heteronymous hemianopia A loss of vision in either both nasal halves (binasal hemianopia) or both temporal halves of the visual field (bitemporal hemianopia). A common cause of the latter is a lesion in the optic chiasma.
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blackout 2. Momentary loss of consciousness, as in absence. 3. Temporary loss of vision, without alteration of consciousness, due to positive g (gravity) forces; caused by temporary decreased blood flow in the central retinal artery, and seen mostly in aviators. 4.
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Hemiparesis Hemiparesis is unilateral paresis, that is, weakness of the entire left or right side of the body (hemi- means half). Hemiplegia is, in its most severe form, complete paralysis of half of the body. Hemiparesis and hemiplegia can be caused by different medical conditions, including congenital causes, trauma, tumors, or stroke.
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Understanding  Cerebral Vision Loss Cortical blindness (CB) refers to profound, bilateral vision loss in adults. Cortical visual impairment (CVI), a relatively new term, is more applicable to neurological loss seen in children. Acute bilateral vision loss in adults is a serious clinical presentation because of the potential for morbidity.
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hemorrhagic stroke Medical Definition of hemorrhagic stroke. : stroke caused by the rupture of a blood vessel in or on the surface of the brain with bleeding into the surrounding tissue ◆Hemorrhagic stroke occurs most often from rupture of an aneurysm or an abnormally formed blood vessel. —compare ischemic stroke.
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Right sided hemiparesis Hemiparesis and hemiplegia. Hemiparesis refers to one-sided ('hemi') weakness ('paresis') The words 'hemiparesis' and 'hemiplegia' are used next to each other in practice. In fact, 'plegia' means complete paralysis and 'paresis' means partial paralysis; On one side of the body both arm and leg and face can be affected. It may also be that only the arm is affected, or only the leg or facial muscles. Hemiparesis affects roughly 80 percent of stroke survivors, causing weakness or the inability to move one side of the body. Symptoms after a stroke in the right. hemisphere.
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- H Homonymous visual field defects are the result of a retrochiasmal lesion. Lesions of the optic tract and the lateral geniculate body. Because the nerve fibers are concentrated in a very small space, the visual field defect that occurs typically in these lesions is homonymous hemianopsia.
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- 25,11,18] Homonymous hemianopsia is the most emphasized complication,[25] because of the close proximity of the pallidal lesions to the optic tract, but its incidence has been reduced by improved stereotactic techniques.
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hemophilia Definition of hemophilia : a hereditary, sex-linked blood defect occurring almost exclusively in males that is marked by delayed clotting of the blood with prolonged or excessive internal or external bleeding after injury or surgery and in severe cases spontaneous bleeding into joints and muscles and that is caused by a deficiency of clotting factors Note: ◆Hemophilia is ...
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op-, opt-, optico-, opsi-, opso-, -opia, -ops, -opsia, -opsis, -opsy, -optic, -opic, -opy + achromatopsia (s) (noun) , achromatopsias)pl). A rare form of color vision impairment in which the world is seen only in black, white, and shades of gray. This hereditary disorder of sight is the result of a lack of cone vision; that type of vision which is provided by the cone photoreceptors in the retina. In the normal human eye, it is estimated that there are about six million cone photoreceptors that are located largely in the center of the retina.
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Continuing education program: focusâ¦Imaging of the optic chiasm and retrochiasmal visual pathways A bitemporal hemianopsis suggests a lesion of the optic chiasm while homonymous lateral hemianopsis should lead to a search for a lesion of the retrochiasmal visual pathways. The causes of chiasmal impairment are mainly tumoral.
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Hemianopsia Hemianopsia, or hemianopia, is a decreased vision or blindness (anopsia) in half the visual field, usually on one side of the vertical midline.The most common causes of this damage are stroke, brain tumor, and trauma.emianopsia, or hemianopia, is a decreased vision or blindness (anopsia) in half the visual field, usually on one side of the vertical midline.
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Binasal hemianopsia The visual field of each eye can be divided in two vertically, with the outer half being described as temporal, and the inner half being described as nasal. Binasal hemianopsia can be broken down as follows: 1  bi-: involves both left and right visual fields.  nasal: involves the nasal visual field.