Partial or complete loss of vision in one half of the visual field(s) of one or both eyes. Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual field. Homonymous hemianopsia refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the midline of the visual field. Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. Bitemporal hemianopsia is the bilateral loss of vision in the temporal fields. Quadrantanopsia refers to loss of vision in one quarter of the visual field in one or both eyes.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.

Surgical treatment of internal carotid artery anterior wall aneurysm with extravasation during angiography--case report. (1/219)

A 54-year-old female presented subarachnoid hemorrhage from an aneurysm arising from the anterior (dorsal) wall of the internal carotid artery (ICA). During four-vessel angiography, an extravasated saccular pooling of contrast medium emerged in the suprasellar area unrelated to any arterial branch. The saccular pooling was visualized in the arterial phase and cleared in the venophase during every contrast medium injection. We suspected that the extravasated pooling was surrounded by hard clot but communicated with the artery. Direct surgery was performed but major premature bleeding occurred during the microsurgical procedure. After temporary clipping, an opening of the anterior (dorsal) wall of the ICA was found without apparent aneurysm wall. The vessel wall was sutured with nylon thread. The total occlusion time of the ICA was about 50 minutes. Follow-up angiography demonstrated good patency of the ICA. About 2 years after the operation, the patient was able to walk with a stick and to communicate freely through speech, although left hemiparesis and left homonymous hemianopsia persisted. The outcome suggests our treatment strategy was not optimal, but suture of the ICA wall is one of the therapeutic choices when premature rupture occurs in the operation.  (+info)

Visual perception of motion, luminance and colour in a human hemianope. (2/219)

Human patients rendered cortically blind by lesions to V1 can nevertheless discriminate between visual stimuli presented to their blind fields. Experimental evidence suggests that two response modes are involved. Patients are either unaware or aware of the visual stimuli, which they are able to discriminate. However, under both conditions patients insist that they do not see. We investigate the fundamental difference between percepts derived for the normal and affected hemifield in a human hemianope with visual stimuli of which he was aware. The psychophysical experiments we employed required the patient, GY, to make comparisons between stimuli presented in his affected and normal hemifields. The subject discriminated between, and was allowed to match, the stimuli. Our study reveals that the stimulus parameters of colour and motion can be discriminated and matched between the normal and blind hemifields, whereas brightness cannot. We provide evidence for associations between the percepts of colour and motion, but a dissociation between the percepts of brightness, derived from the normal and hemianopic fields. Our results are consistent with the proposal that the perception of different stimulus attributes is expressed in activity of functionally segregated visual areas of the brain. We also believe our results explain the patient's insistence that he does not see stimuli, but can discriminate between them with awareness.  (+info)

When the left brain is not right the right brain may be left: report of personal experience of occipital hemianopia. (3/219)

OBJECTIVES: To make a personal report of a hemianopia due to an occipital infarct, sustained by a professor of neurology. METHODS: Verbatim observation of neurological phenomena recorded during the acute illness. RESULTS: Hemianopia, visual hallucinations, and non-occipital deficits without extraoccipital lesions on MRI, are described and discussed. CONCLUSIONS: Hemianopia, due to an occipital infarct, without alexia, is not a disability which precludes a normal professional career. Neurorehabilitation has not been necessary.  (+info)

The association of visual field deficits and visuo-spatial neglect in acute right-hemisphere stroke patients. (4/219)

BACKGROUND: Visuo-spatial neglect (VSN) after stroke is associated with a poor prognosis for rehabilitation. The co-existence of a visual field deficit (VFD) with VSN may be associated with impaired visuo-spatial functioning and thereby poor functional outcome. OBJECTIVE: To determine whether the presence of a VFD (i) exacerbates VSN and (ii) influences recovery of VSN. METHODS: A prospective study of consecutive acute (<7 days), right-hemisphere stroke patients who were able to undergo detailed assessment of visuo-spatial functioning and visual fields. Clinical assessment and a standardized neuropsychological test was administered by one observer, followed by independent assessment of visual fields by a second observer. Patients were followed up for 12 weeks with 4-weekly re-assessments. RESULTS: 44 consecutive patients (23 women) with a first in a lifetime, acute hemisphere stroke were recruited. Twenty had VSN and VFD, seven VSN only, one VFD only and 17 had normal visual fields and no neglect. The finding of a VFD was significantly associated with the presence of VSN (P<0.0001). Patients with both VFD and VSN had a significantly lower score on the behavioural inattention test. One month post-stroke, this difference was no longer significant. Recovery of VSN and VFD was maximal in the first month, however VSN recovery continued for up to 12 weeks. Patients with VSN and a VFD on admission had a greater mortality at 1 and 3 months. CONCLUSION: The presence of a VFD does appear to exacerbate neglect in the acute stroke patient; this effect is no longer seen after 1 month. Recovery of VSN continues independent of a VFD. Patients with neglect and a VFD have an increased mortality, probably because of greater neurological impairment.  (+info)

Attention without awareness in blindsight. (5/219)

The act of attending has frequently been equated with visual awareness. We examined this relationship in 'blindsight'--a condition in which the latter is absent or diminished as a result of damage to the primary visual cortex. Spatially selective visual attention is demonstrated when information that stimuli are likely to appear at a specific location enhances the speed or accuracy of detection of stimuli subsequently presented at that location. In a blindsight subject, we showed that attention can confer an advantage in processing stimuli presented at an attended location, without those stimuli entering consciousness. Attention could be directed both by symbolic cues in the subject's spared field of vision or cues presented in his blind field. Cues in his blind field were even effective in directing his attention to a second location remote from that at which the cue was presented. These indirect cues were effective whether or not they themselves elicited non-visual awareness. We concluded that the spatial selection of information by an attentional mechanism and its entry into conscious experience cannot be one and the same process.  (+info)

Parietal and occipital lobe contributions to perception of straight ahead orientation. (6/219)

OBJECTIVES: Several studies have investigated how peripheral stimulation affects the perception of body orientation in healthy subjects. The studies showed that opposing stimulation of two different input modalities can cancel out, leaving perception of body orientation unchanged. It was ascertained whether a comparable phenomenon could be found in brain damaged patients with two distinct disorders which individually lead to opposing shifts of the perceived midline. METHODS: The visual subjective straight ahead was measured in patients with pure neglect, pure hemianopia, or a combination of neglect and hemianopia. RESULTS: As in previous studies, patients with pure neglect displayed an ipsilesional displacement of the perceived straight ahead. Patients with pure hemianopia showed a contralesional shift. By contrast, no significant midline shift occurred in the patients with both neglect and hemianopia. CONCLUSIONS: Neglect and hemianopia interact so that opposing biases in the perception of body orientation neutralise each other. Both parietal and occipital areas seem to contribute to the perception of straight ahead body orientation and seem to have counteracting effects when lesioned in the same hemisphere.  (+info)

Bitemporal pseudohemianopia related to the "tilted disk" syndrome: CT, MR, and fundoscopic findings. (7/219)

We describe a case of the "tilted-disk" syndrome in a patient with a bitemporal field depression (a pseudohemianopia). CT and MR imaging showed thinning and prolapse of the nasal sectors of the posterior walls of the globes and flattening of the temporal portion of the globes.  (+info)

The oculomotor distractor effect in normal and hemianopic vision. (8/219)

The present study investigated the inhibitory effect of visual distractors on the latency of saccades made by hemianopic and normal human subjects. The latency of saccades made by hemianopic subjects to stimuli in their intact visual field was not affected by visual distractors presented within their hemianopic field. In contrast, the latency of saccades made by normal subjects was increased significantly under distractor conditions. The latency increase was larger for temporal than nasal distractors. The results are inconsistent with previous proposals that the crossed retinotectal pathway from the nasal hemiretina to the superior colliculus may mediate a blindsight inhibitory effect when distractors appear within a hemianopic temporal visual field. Instead, the distractor effect appears to reflect the normal processes involved in saccade target selection which may be mediated by a circuit involving both cortical and subcortical structures.  (+info)

Hemianopsia is a medical term that refers to a loss of vision in half of the visual field in one or both eyes. It can be either homonymous (the same side in both eyes) or heteronymous (different sides in each eye). Hemianopsia usually results from damage to the optic radiations or occipital cortex in the brain, often due to stroke, trauma, tumor, or other neurological conditions. It can significantly impact a person's daily functioning and may require visual rehabilitation to help compensate for the vision loss.

Medical Definition:

Magnetic Resonance Imaging (MRI) is a non-invasive diagnostic imaging technique that uses a strong magnetic field and radio waves to create detailed cross-sectional or three-dimensional images of the internal structures of the body. The patient lies within a large, cylindrical magnet, and the scanner detects changes in the direction of the magnetic field caused by protons in the body. These changes are then converted into detailed images that help medical professionals to diagnose and monitor various medical conditions, such as tumors, injuries, or diseases affecting the brain, spinal cord, heart, blood vessels, joints, and other internal organs. MRI does not use radiation like computed tomography (CT) scans.

X-ray computed tomography (CT or CAT scan) is a medical imaging method that uses computer-processed combinations of many X-ray images taken from different angles to produce cross-sectional (tomographic) images (virtual "slices") of the body. These cross-sectional images can then be used to display detailed internal views of organs, bones, and soft tissues in the body.

The term "computed tomography" is used instead of "CT scan" or "CAT scan" because the machines take a series of X-ray measurements from different angles around the body and then use a computer to process these data to create detailed images of internal structures within the body.

CT scanning is a noninvasive, painless medical test that helps physicians diagnose and treat medical conditions. CT imaging provides detailed information about many types of tissue including lung, bone, soft tissue and blood vessels. CT examinations can be performed on every part of the body for a variety of reasons including diagnosis, surgical planning, and monitoring of therapeutic responses.

In computed tomography (CT), an X-ray source and detector rotate around the patient, measuring the X-ray attenuation at many different angles. A computer uses this data to construct a cross-sectional image by the process of reconstruction. This technique is called "tomography". The term "computed" refers to the use of a computer to reconstruct the images.

CT has become an important tool in medical imaging and diagnosis, allowing radiologists and other physicians to view detailed internal images of the body. It can help identify many different medical conditions including cancer, heart disease, lung nodules, liver tumors, and internal injuries from trauma. CT is also commonly used for guiding biopsies and other minimally invasive procedures.

In summary, X-ray computed tomography (CT or CAT scan) is a medical imaging technique that uses computer-processed combinations of many X-ray images taken from different angles to produce cross-sectional images of the body. It provides detailed internal views of organs, bones, and soft tissues in the body, allowing physicians to diagnose and treat medical conditions.

Temporary hemianopsia can occur in the aura phase of migraine. The word hemianopsia is from Greek origins, where: hemi means " ... This article deals only with permanent hemianopsia, and not with transitory or temporary hemianopsia, as identified by William ... It is separated into two categories: Binasal hemianopsia - the loss of the fields surrounding the nose; Bitemporal hemianopsia ... A homonymous hemianopsia is the loss of half of the visual field on the same side in both eyes. The visual images that we see ...
... blindness Bitemporal hemianopsia Homonymous hemianopsia (Articles with short description, Short description is different from ... Binasal hemianopsia is the medical description of a type of partial blindness where vision is missing in the inner half of both ... In binasal hemianopsia, vision is missing in the inner (nasal or medial) half of both the right and left visual fields. ... "Binasal hemianopsia" can be broken down as follows: bi-: involves both left and right visual fields nasal: involves the nasal ...
Binasal hemianopsia Homonymous hemianopsia Monocular temporal hemianopia "Bitemporal hemianopsia". Science Daily. Peli, E; ... Bitemporal hemianopsia, is the medical description of a type of partial blindness where vision is missing in the outer half of ... In bitemporal hemianopsia, vision is missing in the outer (temporal or lateral) half of both the right and left visual fields. ... Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure ...
... blindness Homonymous hemianopsia is also called homonymous hemianopia. Binasal hemianopsia Bitemporal hemianopsia Blindsight ... Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but ... or demyelination is the cause of homonymous hemianopsia. Homonymous hemianopsia secondary to posterior cerebral artery ... Homonymous hemianopsia occurs because the right half of the brain has visual pathways for the left hemifield of both eyes, and ...
"Bitemporal hemianopsia". Science Daily. "Pediatric Vomiting". The Lecturio Medical Concept Library. Retrieved 19 July 2021. " ... People may present with bitemporal inferior quadrantanopia leading to bitemporal hemianopsia, as the tumor may compress the ... and bitemporal hemianopsia. CT scan showing a craniopharyngioma Enhanced T1 weighted MRIs of craniopharyngiomas Micrograph ...
"Visual Field Loss - Hemianopsia.net Everything you need to know about Hemianopsia". www.hemianopsia.net. "Amsler grid". Smart ...
Contralateral homonymous hemianopsia is often present. Wikimedia Commons has media related to Arteria cerebri media. ...
Bitemporal hemianopsia (loss of peripheral vision). "Visual Field". NIH, US National Library of Medicine. Medline Plus. ...
Bilateral homonymous hemianopsia, cortical blindness, awareness or denial of blindness; tactile naming, achromatopia (color ... Visual field defects (contralateral hemianopsia with macular sparing). Prosopagnosia with bilateral obstruction of the lingual ... Structures involved Homonymous hemianopsia (often upper quadrantic): Calcarine cortex or optic radiation nearby. ...
Neglect is not to be confused with hemianopsia. Hemianopsia arises from damage to the primary visual pathways cutting off the ... hemianopsia, age, visual memory, verbal memory, and visuoconstructional ability. Neglect is probably among the reasons patients ...
Hemianopsia Binasal hemianopsia Bitemporal hemianopsia Whishaw, I. Q., & Kolb, B. (2015). Fundamentals of Human Neuropsychology ... Windsor, R. L. (n.d.). Visual Fields in Brain Injury - Hemianopsia.net Everything you need to know about Hemianopsia. Retrieved ... from http://www.hemianopsia.net/visual-fields-in-brain-injury/ Carroll, J. N., & Johnson, C. A. (2013, August 22). Visual Field ...
For example, visual field testing might demonstrate homonymous hemianopsia with macular sparing.) In the case of ...
A lesion in the left optic tract will cause right-sided homonymous hemianopsia, while a lesion in the right optic tract will ... Main characteristic feature of lesion involving whole optic tract is homonymous hemianopsia. ... cause left-sided homonymous hemianopsia. The optic tract syndrome is characterized by a contralateral, incongruous homonymous ...
Aoki N. Partially thrombosed aneurysm presenting as the sudden onset of bitemporal hemianopsia. Neurosurgery. 1988 Mar;22(3): ... are the most common circle of Willis aneurysm and can cause visual field defects such as bitemporal heteronymous hemianopsia ( ...
Homonymous hemianopsia is another sensory deficit that is sometimes observed in this population. Stroke is the most common ...
Right hemiparesis or hemiplegia, right-sided sensory loss, and right homonymous hemianopsia may manifest as well. Persons with ...
Some people lose part of their field of vision known as hemianopsia while others experience blurring. Sensory aura are the ...
... classically bitemporal hemianopsia. It arises from the compression of the optic nerve by the tumor. The specific area of the ... a condition called bitemporal hemianopsia. If originating superior to the optic chiasm, more commonly in a craniopharyngioma of ...
Paris as seen with full visual fields Paris as seen with bitemporal hemianopsia Paris as seen with binasal hemianopsia Paris as ... Lesions of the visual pathway cause characteristic forms of visual disturbances, including homonymous hemianopsia, ... seen with left homonymous hemianopsia Paris as seen with right homonymous hemianopsia Tubular vision Central field defect in ...
If both divisions on one side of the brain are affected, the result is a contralateral homonymous hemianopsia. The upper ...
For temporal bone directed bullets, temporal lobe abscess, meningitis, aphasia, hemianopsia, and hemiplegia are common late ...
The study subjects were two patients who suffered from hemianopsia-blindness in more than half of their visual field. Both ...
Amaurosis Hemianopsia Ocular ischemic syndrome Retinal migraine Benavente O, Eliasziw M, Streifler JY, Fox AJ, Barnett HJ, ...
Floater Scotomization Amsler grid Horizontal eccentricity Visual field test Binasal hemianopsia Bitemporal hemianopsia Cortical ... the scotomas extend out to the periphery to cause the characteristic bitemporal hemianopsia. This type of visual-field defect ...
If one occipital lobe is damaged, the result can be homonymous hemianopsia vision loss from similarly positioned "field cuts" ...
He demonstrated that homonymous hemianopsia was caused by lesions in the occipital lobe and optic radiation as well as the ...
This cyst typically doesn't cause symptoms, but, if large enough, it may cause vision loss, bitemporal hemianopsia, blurry ...
... hemianaesthesia and homonomous hemianopsia due to occlusion of the anterior choroidal artery. He was responsible for ...
... hemianopsia, and hemiparesis. He named this disease 'encenphailitis subcorticalis chronica progressive.' Binswanger did not ...
... homonymous hemianopsia and bitemporal hemianopia. External examination of eyes consists of inspection of the eyelids, ...
Temporary hemianopsia can occur in the aura phase of migraine. The word hemianopsia is from Greek origins, where: hemi means " ... This article deals only with permanent hemianopsia, and not with transitory or temporary hemianopsia, as identified by William ... It is separated into two categories: Binasal hemianopsia - the loss of the fields surrounding the nose; Bitemporal hemianopsia ... A homonymous hemianopsia is the loss of half of the visual field on the same side in both eyes. The visual images that we see ...
1. hemianopia, hemianopsia, visual impairment, visual defect, vision defect, visual disorder. usage: blindness in one half of ...
Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. Bitemporal hemianopsia is the bilateral ... Homonymous hemianopsia refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the ... Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual ... "Hemianopsia" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical Subject ...
Hemianopsia. The mechanism for hemianopsia is similar to that for hemiparesis and is dependent on the location of the lesions. ... Uram and Zullabigo reported hemianopsia in 11 (44%) of 25 patients. [43] In 2009, Shimakawa et al reported a rare case of ... Shimakawa S, Miyamoto R, Tanabe T, Tamai H. Prolonged left homonymous hemianopsia associated with migraine-like attacks in a ... Focal deficits - Including hemiparesis and hemianopsia, both of which may be transient (called "strokelike episodes") ...
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The purpose of this course is to describe homonymous hemianopsia (HH) and visual field cut, discuss diagnoses that can cause a ... and review intervention strategies to maximize occupational performance despite homonymous hemianopsia. Intermediate Level ... https://www.motivationsceu.com/product-page/7213-homonymous-hemianopsia-a-beginner-s-guide-to-assessment-intervention. ...
1 October 2016 , Claire Howard , Neuro-Ophthalmology , Bitemporal, Mycobacterium, ethambutol, hemianopsia, toxicity ... Bitemporal hemianopsia as a result of ethambutol toxicity Reviewed by Claire Howard. ... In patients being treated with ethambutol, reversible bitemporal hemianopsia was the most commonly noted presentation. The case ... this case series suggests that bitemporal hemianopsia, reduction of visual acuity and loss of colour vision are the most common ...
J., whose hemianopsia was a result of a stroke -another form of TBI. Mr. J. registered for the residential program at WBRC ... A person with hemianopsia is literally not getting the whole picture, and may go for years completely unaware of it. Therefore ... Illustrations often represent hemianopsia as black curtain over half the eye, but this is misleading. In fact, says, Kingston ... Someone with a left hemianopsia for example, has damaged pathways on the right side of the brain and does not see objects or ...
A complete right hemianopsia, as David Hubel (1988) pointed out, entails for instance the dimming of the center of gaze, with a ... In individuals in whom it tends to occur, hemianopsia (or hemianopia) involves the loss of one half of a visual field. ... I, p. 540, my trans.). What are the symptoms displayed by patients affected by hemianopsia and subsequent loss of usual sensory ... On hemianopsia, vision and adaptive reactions in organisms pathological states. 29 November 2022 ...
opsia definition, variant of -opia: hemianopsia. See more. ...
Vision problems, such as eye strain or poor eyesight, may cause dizziness and balance issues. Learn more about the relationship and other causes of dizziness here.
Infrared oculographic recordings from three patients with hemianopia due to an occipital lesion showed that these patients employed a consistent set of (presumably unconscious) compensatory strategies to find and fixate objects. For targets in the blind hemifield, patients at first used a staircase …
Hemianopsia / physiopathology* * Humans * Male * Middle Aged * Neurologic Examination / methods * Recovery of Function / ...
Heteronymous Hemianopsia, Altitudinal hemianopsia, Quadrantanopsia, Quadrantanopia, Homonymous Quadrant Anopia. ... Heteronymous Hemianopsia, Altitudinal hemianopsia, Quadrantanopsia, Quadrantanopia, Homonymous Quadrant Anopia ... Hemianopsia (Hemianopia). *Partial or complete loss of Vision in one half of the Visual Fields of one or both eyes ... Homonymous Hemianopsia (Hemianopia). *Visual Field Defect with same half of Visual Field loss from each eye (left or right ...
hemianopsia. blindness in one eye hemiolic. based on the ratio of 3 to 2 hemiplegic. paralyzed on one side only hemistich. half ...
hemianopsia hemianopia - visual field cut. Blindness for one half of the field of vision. This is not the right or left eye, ...
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Loss of vision on one side (hemianopsia). *Headache *Usually occurs on one side of the head, but may occur on both sides ...
Adenomas hipofisários clinicamente não funcionantes (ACNF hipofisários) são abordados aqui; já os adenomas hipofisários funcionantes (por exemplo, acromegalia, síndrome de Cushing, prolactinoma) são tratados separadamente. Tumores hipofisários pequenos (|4 mm) são comuns e são relatados em até 10...
Patients with hemianopsia or quadrantanopsia fail to see the finger until it nears midline. ... and those exhibiting homonymous hemianopsia or quadrantanopsia were not enrolled in this study.d ...
Contralateral hemianopsia. Cerebellopontine angle. Decreased hearing with possible facial weakness and facial numbness ...
Complications for both groups included transient homonymous hemianopsia and aphasia. No recurrences were identified over the ...
Parietal - Hemisensory loss, homonymous hemianopsia, hemi-inattention, and apraxia are all signs of parietal ICH ...
Keywords: low-vision, rehabilitation, virtual-reality, personalized medicine 2, hemianopia or hemianopsia, hemianopia ...
Occipital seizures and hemianopsia can be caused by hyperglycemia and may be accompanied by special MRI and VEP findings. [65] ...
Journal Article] Perceiving ghost images: a unique case of visual allesthesia with hemianopsia in mitochondrial disease.2014 ...
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These may include hallucinations, aphasia, nystagmus, hemianopsia, hemiplegia, hemisensory deficits, and focal or grand mal ...
  • A homonymous hemianopsia is the loss of half of the visual field on the same side in both eyes. (wikipedia.org)
  • Homonymous hemianopsia refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the midline of the visual field. (childrensmercy.org)
  • The purpose of this course is to describe homonymous hemianopsia (HH) and visual field cut, discuss diagnoses that can cause a visual field cut, review quick screening tools, and review intervention strategies to maximize occupational performance despite homonymous hemianopsia. (maineot.org)
  • world- right homonymous hemianopsia, and Romberg sign. (cdc.gov)
  • Approximately 40-50% of patients with GCA have ophthalmologic complications, including visual loss secondary to A-AION, central retinal artery occlusion, homonymous hemianopsia or cortical blindness (uni- or bilateral occipital infarction) [ 6 ]. (intechopen.com)
  • Bilateral Homonymous Hemianopsia with Preservation of Central Vision. (ucf.edu)
  • As a residual deficit of the Stroke, he suffered from homonymous hemianopsia (right side visual loss in both eyes). (todaysgeriatricmedicine.com)
  • Having homonymous hemianopsia made it very difficult for Dr. Ramon to read, watch TV, and go to the movies - things that he used to enjoy easily before his stroke. (todaysgeriatricmedicine.com)
  • 8. Homonymous hemianopsia, quadrantopsia, bitemporal hemianopsia, or central scotoma related to cerebral vascular disease by Automated Visual field testing and confrontation visual field testing. (who.int)
  • Hemianopsia, or hemianopia, is a loss of vision or blindness (anopsia) in half the visual field, usually on one side of the vertical midline. (wikipedia.org)
  • In individuals in whom it tends to occur, hemianopsia (or hemianopia ) involves the loss of one half of a visual field. (dialecticalsystems.eu)
  • Quadrantanopia (quadrantanopsia or quadrantic hemianopsia) is decreased vision or blindness in one quarter of the visual field. (wikipedia.org)
  • A loss of the outer peripheral vision (called a "bitemporal hemianopsia") or complete blindness can occur. (uclahealth.org)
  • Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. (childrensmercy.org)
  • Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual field. (childrensmercy.org)
  • Anterior extension to the optic chiasm can result in a classic bitemporal hemianopsia, unilateral temporal hemianopsia, papilledema, or unilateral/bilateral decrease in visual acuity. (medscape.com)
  • The optic chiasm lies in close proximity to the pituitary gland and can be compressed by tumors leading to visual disturbances (bitemporal hemianopsia) [6]. (bvsalud.org)
  • Bitemporal hemianopsia is the bilateral loss of vision in the temporal fields. (childrensmercy.org)
  • Visual neglect (also called hemispatial neglect or unilateral spatial neglect) differs from hemianopsia in that it is an attentional deficit rather than a visual one. (wikipedia.org)
  • Temporary hemianopsia can occur in the aura phase of migraine. (wikipedia.org)
  • Some patients with neglect also have hemianopsia, however the two often occur independent of one another. (wikipedia.org)
  • Kingston introduced me to a patient whom we'll call Mr. J., whose hemianopsia was a result of a stroke -another form of TBI. (visionaware.org)
  • Unlike patients with hemianopsia who actually don't see, those with visual neglect have no trouble seeing but are impaired in attending to and processing the visual information they receive. (wikipedia.org)
  • Whereas hemianopsia can be assuaged by allowing patients to move their eyes around a visual scene (ensuring that the entire scene makes it into their intact visual field), neglect cannot. (wikipedia.org)
  • The authors present six cases of visual loss in patients treated with ethambutol for mycobacterium avium complex, including four patients with bitemporal hemianopsia. (uk.com)
  • In patients being treated with ethambutol, reversible bitemporal hemianopsia was the most commonly noted presentation. (uk.com)
  • Although there is variability in the visual findings of the six reported patients, this case series suggests that bitemporal hemianopsia, reduction of visual acuity and loss of colour vision are the most common presentation of visual toxicity due to ethambutol. (uk.com)
  • What are the symptoms displayed by patients affected by hemianopsia and subsequent loss of usual sensory action of fovea? (dialecticalsystems.eu)
  • Chiasmal compression may result in bitemporal HEMIANOPSIA. (embl.de)
  • A complete right hemianopsia, as David Hubel (1988) pointed out, entails for instance the dimming of the center of gaze, with a decreased efficiency of the foveal region: it is as if, viewing the word far and trying to focus on the a , you could not see the r , but only the f and the left side of the a . (dialecticalsystems.eu)
  • Superior hemianopsia - the upper half of the field of vision is affected, possibly because of a tumor beginning to compress the lower part of the chiasma, typically one from the hypophysis. (wikipedia.org)
  • Inferior hemianopsia - the lower half of the field of vision is affected, possibly because of a tumor beginning to compress the upper part of the chiasma, typically a craniopharyngioma. (wikipedia.org)
  • I had the opportunity to visit the Western Blind Rehabilitation Center and spoke to John Kingston, Orientation and Mobility Supervisor and Acting Comprehensive Neurological Vision Rehabilitation (CNVR) Coordinator, to learn about an innovative therapy that was helping veterans adapt to hemianopsia. (visionaware.org)
  • Therefore, the first step in treating hemianopsia is to demonstrate that there is a visual field loss and to have the person experience what they are missing. (visionaware.org)
  • A heteronymous hemianopsia is the loss of half of the visual field on different sides in both eyes. (wikipedia.org)
  • Someone with a left hemianopsia for example, has damaged pathways on the right side of the brain and does not see objects or people on his left side when looking straight ahead. (visionaware.org)
  • Another very common occurrence is hemianopsia, a condition in which a person loses half of his field of view. (visionaware.org)
  • A person with hemianopsia is literally not getting the whole picture, and may go for years completely unaware of it. (visionaware.org)
  • This graph shows the total number of publications written about "Hemianopsia" by people in this website by year, and whether "Hemianopsia" was a major or minor topic of these publications. (childrensmercy.org)
  • Below are the most recent publications written about "Hemianopsia" by people in Profiles. (childrensmercy.org)
  • A homonymous hemianopsia is the loss of half of the visual field on the same side in both eyes. (wikipedia.org)
  • world- right homonymous hemianopsia, and Romberg sign. (cdc.gov)
  • However, if a patient with prosopagnosia presents with left-sided homonymous hemianopsia, there should be concern for a right-sided occipital lesion. (aao.org)
  • Homonymous hemianopsia refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the midline of the visual field. (nih.gov)
  • A case of left homonymous hemianopsia, probably hysterical. (nih.gov)
  • We report the case of a 54-year-old Chinese man who developed progressive bitemporal hemianopsia and visual loss. (unboundmedicine.com)
  • Here, we report the case of a 67-year-old woman who presented with bitemporal hemianopsia and visual impairment accompanied by mildly elevated prolactin. (uzh.ch)
  • Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. (nih.gov)
  • Introduction: Reversible posterior leukoencephalopathy syndrome - a reversible subacute global encephalopathy clinically presenting with headache, altered mental status, visual symptoms such as hemianopsia or cortical blindness, motor symptoms, and focal or generalized seizures - is characterized by a subcortical vasogenic edema symmetrically affecting posterior brain regions. (uni-wuerzburg.de)
  • I am sad to report that my dad today presented with symptoms of right hemianopsia. (cancergrace.org)
  • Superior hemianopsia - the upper half of the field of vision is affected, possibly because of a tumor beginning to compress the lower part of the chiasma, typically one from the hypophysis. (wikipedia.org)
  • Inferior hemianopsia - the lower half of the field of vision is affected, possibly because of a tumor beginning to compress the upper part of the chiasma, typically a craniopharyngioma. (wikipedia.org)
  • Chiasmal compression may result in bitemporal HEMIANOPSIA. (curehunter.com)
  • Bitemporal hemianopsia is the bilateral loss of vision in the temporal fields. (nih.gov)
  • The dura is opened, and the meningioma can be seen extending en plaque over the surface of the brain. (medscape.com)
  • Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual field. (nih.gov)
  • A heteronymous hemianopsia is the loss of half of the visual field on different sides in both eyes. (wikipedia.org)
  • Whereas hemianopsia can be assuaged by allowing patients to move their eyes around a visual scene (ensuring that the entire scene makes it into their intact visual field), neglect cannot. (wikipedia.org)
  • It turned out that Jay suffered from hemianopsia, a loss of half of the visual field. (benetech.org)
  • For example, if you use CAD software or work on medical documents, you could enter terms such as DIMSTYLE or hemianopsia to ensure that the words are entered correctly when you use Voice Control. (apple.com)