Bitemporal hemianopia; its unique binocular complexities and a novel remedy

Peli, Eli; Satgunam, PremNandhini

doi:10.1111/opo.12118

Cited by 24 publications

(22 citation statements)

References 24 publications

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“…Where the damage is permanent, however, patients are left with very little binocular function. There are very few studies in which stereoscopic depth perception has been systematically studied, although a recent study investigated the deficits in two patients with bitemporal hemianopia [ 78 ]. Under normal binocular viewing, mismatched images in the two eyes can stimulate fusional eye movements to align the images [ 79 ].…”

Section: Depth Perception In Bitemporal Hemianopiamentioning

confidence: 99%

Effects of cortical damage on binocular depth perception

Bridge

2016

Phil. Trans. R. Soc. B

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Stereoscopic depth perception requires considerable neural computation, including the initial correspondence of the two retinal images, comparison across the local regions of the visual field and integration with other cues to depth. The most common cause for loss of stereoscopic vision is amblyopia, in which one eye has failed to form an adequate input to the visual cortex, usually due to strabismus (deviating eye) or anisometropia. However, the significant cortical processing required to produce the percept of depth means that, even when the retinal input is intact from both eyes, brain damage or dysfunction can interfere with stereoscopic vision. In this review, I examine the evidence for impairment of binocular vision and depth perception that can result from insults to the brain, including both discrete damage, temporal lobectomy and more systemic diseases such as posterior cortical atrophy.This article is part of the themed issue ‘Vision in our three-dimensional world’.

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Section: Depth Perception In Bitemporal Hemianopiamentioning

confidence: 99%

Effects of cortical damage on binocular depth perception

Bridge

2016

Phil. Trans. R. Soc. B

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“…5 In some patients treatment with optical measures such as prism can be helpful to reduce the frequency of diplopia. 14 The association between abnormalities of binocular vision and congenital chiasmal syndromes has been well documented. In adults, loss of stereopsis can be a presenting feature of a chiasmal lesion.…”

Section: Diplopia and Loss Of Stereopsismentioning

confidence: 99%

Visual Findings in Chiasmal Syndromes

Foroozan¹

2016

International Ophthalmology Clinics

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The optic chiasm is an important neuroanatomic landmark, in particular as it relates to the pituitary gland and endocrinologic syndromes. Pathology that affects the chiasm helps emphasize key principles of neuroanatomy. The most common visual consequence of pituitary tumors is chiasmal compression, and visual findings remain important indicators of central nervous system pathology in many patients with sellar/suprasellar lesions.In this review, I have illustrated several different clinical syndromes that ensue from pathology involving the optic chiasm and discussed the various etiologies of chiasmal pathology. In addition, I have provided several examples of the neuroimaging findings that highlight the anatomy and pathology involving the optic chiasm.I hoped to provide a logical basis for the practicing ophthalmologist in approaching chiasmal disorders. ' AnatomyThe intracranial optic nerves exit the optic canals and travel at a 30-to 45-degree angle to make up the optic chiasm. The optic chiasm is 12 to 18 mm in diameter and contains the decussation of nasal retinal nerve fibers from each of the optic nerves. 1 Inferior retinal fibers representing the superior visual field cross first, whereas macular fibers cross more posteriorly. The chiasm lies 10 mm above the sella turcica, which contains the pituitary gland (Fig. 1).The space inferior to the chiasm and above the sella is the basal cistern. Anteriorly, the chiasm is exposed to cerebrospinal fluid; posteriorly it abuts the hypothalamus and the anterior portion of the third ventricle. The anatomic position of the chiasm is described as

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“…Factors influencing the postoperative outcome as well as the complication rate include age [14,32,35], body mass index (BMI) [9], number of surgeries [15], and the surgical approach used [18,29,34] as well as tumor size and sinus suprasellar growth [16]. Typical vision changes and field defects include the bitemporal hemianopsia, leading to binocular vision difficulties [28]. The visual postoperative outcome and recovery are known to be favorable, although influencing factors are currently discussed such as preoperative deficits, tumor size und tumor location, age, duration of symptoms, und tumor recurrence [6,22,31].…”

Section: Introductionmentioning

confidence: 99%

Visual acuity and its postoperative outcome after transsphenoidal adenoma resection

et al. 2020

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Transsphenoidal surgery (TSS) represents the gold standard of pituitary adenoma resection, providing a safe and minimal invasive treatment for patients suffering from symptoms of mass effect. The aim of this study is to analyze the postoperative improvement of visual function after adenoma resection and to identify prognostic factors for the postoperative clinical recovery. We performed a retrospective analysis of all consecutive patients treated via a transsphenoidal approach for pituitary adenomas from April 2006 to December 2019 in a high-volume neurosurgical department. Our primary outcome was postoperative visual acuity and visual field impairment; the clinical findings were followed up to 3 months after surgery and correlated with clinical and radiographic findings. In total, 440 surgeries were performed in our department for tumors of the sella region in a time period of 13 years via transsphenoidal approach, and 191 patients included in the analysis. Mean age was 55 years, and 98% were macroadenomas. Mean preoperative visual acuity in patients with preoperative impairment (n = 133) improved significantly from 0.64/0.65 to 0.72/0.75 and 0.76/0.8 (right eye R/left eye L) postoperatively and at 3 months follow-up (p < 0.001). Visual acuity significantly depended on Knosp classification but not Hardy grading. The strongest predictor for visual function recovery was age. Transsphenoidal pituitary tumor resection remains a safe and effective treatment in patients with preoperative visual impairment. It significantly improves visual acuity and field defects after surgery, and recovery continues at the 3 months follow-up examination.

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Bitemporal hemianopia; its unique binocular complexities and a novel remedy

Cited by 24 publications

References 24 publications

Effects of cortical damage on binocular depth perception

Effects of cortical damage on binocular depth perception

Visual Findings in Chiasmal Syndromes

Visual acuity and its postoperative outcome after transsphenoidal adenoma resection

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