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Topic: Bitemporal hemianopsia

	Encyclopedia: Bitemporal hemianopsia (Site not responding. Last check: 2007-10-17)
		To say, for instance, 'a bitemporal hemianopsia' is to imply the involvement of the temporal fields of both eyes.
		Homonymous hemianopsia implies both a post-chiasmal lesion and a lesion on the side of the brain opposite the compromised half of the binocular field.
		Bitemporal hemianopsia, sometimes called 'tunnel vision' in lay terminology, is indicative of direct or indirect insult of the sagittal portion of the optic chiasm -- where the nasal fibers of the two eyes, as they cross, lie in close proximity.
	www.nationmaster.com /encyclopedia/Bitemporal-hemianopsia (628 words)

	Bitemporal hemianopsia: Just the facts... (Site not responding. Last check: 2007-10-17)
		The absence of vision (A vivid mental image) in half of a visual field (All of the points of the physical environment that can be perceived by a stable eye at a given moment) is described as 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.
		In bitemporal hemianopsia vision is missing in the outer half of both the right and left visual fields.
	www.absoluteastronomy.com /encyclopedia/b/bi/bitemporal_hemianopsia.htm (122 words)

	Hemianopsia topic - Unified Search Environment
		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.
	www.use.hcn.com.au /subject.%60Hemianopsia%60/home.html (108 words)

	Sensory Systems
		Hemianopsia means loss of vision in one half of the visual field.
		Bitemporal hemianopsia means that a person has tunnel vision.
		Homonymous hemianopsia means that the person is blind on either the right or the left side.
	pathology.mc.duke.edu /neuropath/nawr/sensory.html (886 words)

	hemianopsia.html
		When referring to a homonymous hemianopsia, "right" or "left" signify either the right or the left half of the binocular visual field (even though the mapping typically is done one eye at a time).
		Therefore, posterior to the optic chiasm, homonymous members of the pathways are T+N' or T'+N. A hemianopsia may involve all or part of a field, or all or part of a quadrant.
		The hypothetical patient, able to see the central and paracentral (near peripheral) fields, may not be conscious of the loss (consider general unawareness of the blind spot); and he or she may be surprised to learn of the perimetry data.
	www.indiana.edu /~pietsch/hemianopsia.html (3630 words)

	Neurological Exam: Midbrain: Lesions: Neoplasms - Hypothalamus - Glioma (Site not responding. Last check: 2007-10-17)
		Cranial nerve examination was normal except for vision which showed a bitemporal hemianopsia.
		The bitemporal hemianopsia indicates involvement with the optic chiasm.
		Long-standing excessive intake of water suggests diabetes insipidus which may be due to lesions of the hypothalamus or the posterior pituitary for the synthesis and release of antidiuretic hormone (ADH).
	isc.temple.edu /neuroanatomy/lab/lesions/33.htm (292 words)

	Neurological Exam: Midbrain: Lesions: Neoplasms - Hypothalamus - Craniopharyngioma (Site not responding. Last check: 2007-10-17)
		Neurologic examination showed mild papilledema and increased intracranial pressure but otherwise most of the neurologic examination, motor and sensory, was normal.
		Examination of the visual fields however revealed a bitemporal hemianopsia.
		Bitemporal hemianopsia is usually due to midline pressure on the optic chiasm.
	isc.temple.edu /neuroanatomy/lab/lesions/32.htm (165 words)

	Chapr 5
		Hemianopsia means loss of vision in half of the visual field of both eyes.
		Homonymous hemianopsia occurs from lesions of the entire optic tract, the lateral geniculate body, the optic radiation, or the entire visual cortex of the contralateral hemisphere (Fig.
		Bitemporal hemianopsia results from damage of the optic nerve fibres as they cross the optic chiasm (Fig.
	www.mfi.ku.dk /ppaulev/chapter5/chap_5.htm (8806 words)

	[No title] (Site not responding. Last check: 2007-10-17)
		The patient also had a unilateral optic neuropathy and the examination disclosed complete bitemporal hemianopsia.
		Midline basilar skull fractures that traversed the midclivus through the sella turcica floor, dorsum sellae, and sphenoid were present.
		This fracture pattern suggests tearing of the optic chiasm on a microscopic if not macroscopic scale as the cause of the complete bitemporal hemianopsia, in conjuction with the MRI findings.
	www.eyenet.gr /periodiko/sept97/annals18eng.html (100 words)

	Hemianopsia (Site not responding. Last check: 2007-10-17)
		Transient bitemporal hemianopsia during pregnancy after treatment of galactorrhe...
		Hemianopsia Loss of Visual Field Due to Brain Injury Heminopsia Stroke Vision Th...
		Unilateral nasal hemianopsia secondary to posterior subcapsular cataract -- Rahm...
	www.scienceoxygen.com /disease/601.html (202 words)

	Field Rehabilitation: Bitemporal Hemianopsia (Site not responding. Last check: 2007-10-17)
		Bitemporal field loss is usually less debilitating than hemianoptic visual field loss.
		Mary is a 64 year old female who developed a bitemporal field loss from a pituitary tumor.
		Photo: Mary's eye wear is fit with bitemporal field awareness press-on prisms.
	www.nora.cc /patient_area/rehabilitation.html (259 words)

	OMIC Publication Archives
		Ophthalmologist ##2 was felt to have greater exposure than ##1 because he had consecutive visual fields that showed the evolving bitemporal hemianopsia.
		Close review of the formal visual fields show combined arcuate glaucomatous changes and bitemporal hemianopsia, as typically seen with pituitary tumors.
		The past history of glaucoma may have contributed to the misinterpretation of the visual field changes which, when compared with previous bilateral fields, clearly showed the progression of the bitemporal hemianopsia.
	www.omic.com /resources/risk_man/deskref/clinical/18.cfm (2025 words)

	Hemianopsia
		Specialty definitions using "hemianopsia": Classic Migraine ♦ incongruent hemianopsia ♦ ocular migraine, ophthalmic headache, ophthalmic migraine.
		hemiopie, hemiopia, hemianopsie (hemianopia), hemianopsia, hemianopie, hemianopia, hemiamaurosis, hemiamaurose, hemiablepsie, hemiablepsia, halfblindheid.
		hemiopsia (hemianopia), hemiopía (hemianopia), hemianopsia (hemianopia), hemianopía (hemianopia), hemiablepsia (hemianopia), visus dimidiatus (hemianopia), escotoma hemianópsico (hemianopia).
	www.websters-online-dictionary.org /definition/english/He/Hemianopsia.html (472 words)

	What is the exact mechanism of sensory exotroia after visual field defects like bitemporal hemianopsia?
		In patients with full monocular visual fields there is a partial overlapping of the nasal fields of one eye and most of the temporal field of the other eye.
		When there is complete bitemporal hemianopsia or a dense bitemporal hemianopic scotoma from damage to the optic chiasma, this can lead to the hemifield slide phenomenon.
		In this situation, there is no longer overlap of the corresponding points of the central visual field of both eyes leading to no region in the visual field having binocular representation (Kirkham, 1972).
	telemedicine.orbis.org /bins/volume_page.asp?cid=2-65-92-282 (352 words)

	Intracranial tumors show neuro-ophthalmic manifestations - Ophthalmology Times (Site not responding. Last check: 2007-10-17)
		At the junction of the optic nerve and chiasm, junctional lesions may produce monocular hemianopic field loss (junctional scotoma of Traquair) or an ipsilateral optic neuropathy with a contralateral superotemporal field loss (junctional scotoma due to compression of inferonasal fibers in the purported Willebrandt's knee or in the chiasm itself).
		Compression of the body of the chiasm produces the typical bitemporal hemianopsia, and more posterior compression of the optic tract results in a contralateral homonymous hemianopsia.
		In cases of a homonymous hemianopsia, the more posterior the lesion in the retrochiasmal pathway (e.g., occipital lobe), the more congruous the hemianopsia.
	www.ophthalmologytimes.com /ophthalmologytimes/article/articleDetail.jsp?id=32821 (1005 words)

	Publications
		"Bitemporal" means that it affects the temporal area of both eyes, and "hemianopsia" is the term for a defect affecting half of the eye.
		The confrontation visual field test is meant to be a screening device for the larger field defects such as a hemianopsia, a generalized constriction, or a sector defect such as would be produced by a retinal detachment.
		In some cases the map produced by a confrontation field exam is sufficient documentation of the defect.
	www.eyetec.net /group3/M11S2.htm (863 words)

	MALPRACTICE QUIZ
		Visual fields revealed a bitemporal hemianopsia and MRI revealed a 2cm-by-3cm tumor at the chiasm.
		To remove the mass (later labeled a craniopharyngioma) the surgeon had to sacrifice the pituitary gland.
		Automated fields later demonstrated a nearly absolute bitemporal hemianopsia in spite of the normal confrontation fields.
	www.revoptom.com /archive/issue/ro01mal.htm (758 words)

	[No title]
		This is known as bitemporal hemianopsia (blindness in half the visual field; Here the temporal half of each visual field).
		This is known as homonymous hemianopsia (blindness in the same half visual field of each eye), and can be caused by a lesion anywhere behind the optic chiasm.
		A light shined in her right eye produces both direct and consensual light reflexes, but when the light is shined in her left eye, both reflexes are absent.
	www.kumc.edu /research/medicine/pharmacology/CAI/webCAI/anatomy/04d.wbc (665 words)

	Cushing's syndrome III (www.whonamedit.com)
		Syndrome of bitemporal hemianopsia and associated primary optic atrophy.
		Characterized by initial decrease of lateral or central vision, and bitemporal field defects, usually progressive; primary optic atrophy, total blindness may result.
		Chiasmal syndrome of primary optic atrophy and bitemporal field defects in adults with normal sella turcica.
	www.whonamedit.com /synd.cfm/980.html (124 words)

	Student Doctor Network Forums - Case Study
		As a pituitary tumor, a prolactinoma would compress the optic chiasm and cause a bitemporal hemianopsia.
		Anyways, you're correct, meds first (carbergoline, bromocriptine or another dopamine agonists), but surgery may be indicated right away depending on how severe her visual fields were compromised (if they were in fact compromised at all).
		I have bitemporal hemianopsia!" Any visual defects or amaurosis needs to be teased out further in the history.
	forums.studentdoctor.net /archive/index.php/t-84188.html (1462 words)

	Pituitary Adenoma
		Visual symptoms vary and include bitemporal visual field loss more dense from the superior to inferior, color desaturation, diplopia as well as ophthalmoplegia tumors expand into the cavernous sinus.
		This produces the bitemporal hemianopsia with increased density superiorly.
		In pregnant women, bitemporal visual field loss and headache may signal pituitary apoplexy (rapid degeneration with hemorrhagic necrosis of the pituitary gland).
	www.revoptom.com /handbook/SECT54a.HTM (844 words)

	Be aware of the big four As you cannot afford to miss - Ophthalmology Times (Site not responding. Last check: 2007-10-17)
		Pituitary apoplexyMost ophthalmologists would have little difficulty recognizing classic bitemporal hemianopsia as a localizing sign of a chiasmal lesion such as a pituitary adenoma.
		A pituitary lesion may expand superiorly and produce a bitemporal hemianopsia, project anteriorly and produce a unilateral or bilateral optic neuropathy, project posteriorly and produce a homonymous hemianopsia, or project laterally into the cavernous sinus and produce ophthalmoplegia (e.g., third, fourth, sixth nerve, or combination ocular motor palsy).
		These less common signs of pituitary apoplexy should also be considered by the ophthalmologist in the acute setting.
	www.ophthalmologytimes.com /ophthalmologytimes/article/articleDetail.jsp?id=92072 (921 words)

	Perimetric visual field and functional MRI correlation: implications for image-guided surgery in occipital brain ...
		Figure 4 Patient 9: findings obtained in a 51 year old woman with intrasellar and suprasellar hypophysal adenoma and bitemporal hemianopsy.
		hemianopsia caused by a suprasellar extension of a hypophysal
		We also found that fMRI data were correlated with perimetric evaluation in lesions producing visual field defects by deafferentation.
	jnnp.bmjjournals.com /cgi/content/full/71/4/505 (5024 words)

	Transient bitemporal hemianopsia during pregnancy after treatment of galactorrhea-amenorrhea syndrome with ...
		Transient bitemporal hemianopsia during pregnancy after treatment of galactorrhea-amenorrhea syndrome with bromocriptine -- Lamberts et al.
		Transient bitemporal hemianopsia during pregnancy after treatment of galactorrhea-amenorrhea syndrome with bromocriptine
		Periodic assessment of the visual fields showed an increase in size of the
	jcem.endojournals.org /cgi/content/abstract/44/1/180 (174 words)

	Bitemporal Pseudohemianopia Related to the "Tilted Disk" Syndrome: CT, MR, and Fundoscopic Findings -- Manfrè et ...
		Bitemporal Pseudohemianopia Related to the "Tilted Disk" Syndrome: CT, MR, and Fundoscopic Findings -- Manfrè et al.
		Bitemporal Pseudohemianopia Related to the "Tilted Disk" Syndrome: CT, MR, and Fundoscopic Findings
		a patient with a bitemporal field depression (a pseudohemianopia).
	www.ajnr.org /cgi/content/full/20/9/1750 (861 words)

	UVA Neurogram - Pituitary Tumors
		Patients often initially present to their primary physicians with complaints of headache from irritation of the dura mater or fatigue from panhypopituitarism, and as the tumor extends to involve the optic chiasm, they will present with varying degrees of visual loss.
		The classic presentation of the visual deficit is a bitemporal hemianopsia, but central scotomas and generalized blurring of vision are sometimes the complaint.
		Panhypopituitarism as a consequence of mass effect on the normal pituitary gland can result in fatigue and sexual dysfunction ranging from decreased libido to lack of erectile function, and often requires direct questioning of the patient to elicit.
	www.healthsystem.virginia.edu /internet/neurogram/neurogram2_2_pituitary.cfm (1372 words)

	EyeRounds.org: See-Saw Nystagmus
		There have been two cases reported of delayed SSN following trauma which resulted in immediate chiasmal lesion with bitemporal hemianopsia (Eggenberger 2002).
		It was thought that in these cases, the SSN was a delayed response to the traumatic brain injury.
		Eggenberger, E. Delayed-onset Seesaw Nystagmus Posttraumatic Brain Injury with Bitemporal Hemiansopsia.
	webeye.ophth.uiowa.edu /eyeforum/cases/case23.htm (1006 words)

	Case Book continued
		Patients with incidentalomas need to be checked carefully for visual field defects, of which they may be unaware, and subtle hormonal abnormalities.
		The classical visual field defect produced by pituitary tumours is a bitemporal hemianopsia, but many variations occur, from loss of vision in one eye to bitemporal quadrantic defects.
		The visual field defect often will be missed if a stimulus such as wiggling fingers is used.
	www.parkhurstexchange.com /casebook_continued/2005/cb_06_pg2_vol13.html (631 words)

	[No title]
		The function of the major systems will be related to lesions at specific sites in the neural pathways that connect them (e.g.
		a patient with a lesion of the optic chiasm, possibly due to a pituitary neoplasm, would suffer bitemporal hemianopsia).
		This course will prepare students with the medical terminology and neurological concepts for a general understanding of the human brain and its functions in relation to disease and behavior.
	www.utdallas.edu /~lcauller/Courses/NeuroAnat/NAdescription.DOC (236 words)

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