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H Tegetmeyer
Background: The symptom "visual snow" describes the continuous perception of tiny flickering dots within the whole visual field of both eyes. The diagnosis of a visual snow syndrome requires the appearance of typical additional visual symptoms and the exclusion of ophthalmological or neurological causes, or pharmacological influences. Patients and Methods: Three male and four female subjects between 13 and 36 years of age referred with visual snow were investigated and asked about their symptoms. A complete ophthalmological investigation, including binocular fundoscopy, was performed in all patients...
August 10, 2016: Klinische Monatsblätter Für Augenheilkunde
Peggy H Vogt, Garrett Barr, Charles G Maitland
No abstract text is available yet for this article.
September 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
J Kalita, S K Bhoi
No abstract text is available yet for this article.
March 16, 2016: Cephalalgia: An International Journal of Headache
Vincenzo Belcastro, Edoardo Ferlazzo
No abstract text is available yet for this article.
March 16, 2016: Cephalalgia: An International Journal of Headache
Jenny L Lauschke, Gordon T Plant, Clare L Fraser
In this paper we review the visual snow (VS) characteristics of a case cohort of 32 patients. History of symptoms and associated co-morbidities, ophthalmic examination, previous investigations and the results of intuitive colourimetry were collected and reviewed. VS symptoms follow a stereotypical description and are strongly associated with palinopsia, migraine and tinnitus, but also tremor. The condition is a chronic one and often results in misdiagnosis with psychiatric disorders or malingering. Colour filters, particularly in the yellow-blue colour spectrum, subjectively reduced symptoms of VS...
June 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
Meng Huang, David S Baskin, Steve Fung
BACKGROUND: Rapid word recognition and reading fluency is a specialized cortical process governed by the visual word form area (VWFA), which is localized to the dominant posterior lateral occipitotemporal sulcus/fusiform gyrus. A lesion of the VWFA results in pure alexia without agraphia characterized by letter-by-letter reading. Palinopsia is a visual processing distortion characterized by persistent afterimages and has been reported in lesions involving the nondominant occipitotemporal cortex...
May 2016: World Neurosurgery
Isin Unal-Cevik, F Gokcem Yildiz
OBJECTIVE: This study aims to investigate characteristics of visual snow accompanied by migraine and special interest on occipital bending, electrophysiological properties, and response to treatment. BACKGROUND: Visual snow is characterized by continuous dynamically flickering dots in the visual field. Most patients also have comorbid migraine. Cortical hyperexcitability is a feature of migraine. Recent studies indicate an association between occipital bending with psychiatric disorders such as depression...
November 2015: Headache
Vincenzo Belcastro, Umberto Aguglia, Laura R Pisani, Edoardo Ferlazzo
No abstract text is available yet for this article.
September 2015: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
Samuel H Yun, Patrick J Lavin, Martha P Schatz, Robert L Lesser
BACKGROUND: To report palinopsia as a possible side effect of topiramate. METHODS: Case series and review of the literature. RESULTS: Nine patients in our series, and 4 previously reported patients, who developed palinopsia while on topiramate, are reviewed. All patients were women, and comorbidities included migraine, idiopathic intracranial hypertension, and bulimia nervosa. Palinopsia resolved in 8 patients after stopping or decreasing the dose of topiramate...
June 2015: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
O Zambrowski, I Ingster-Moati, C Vignal-Clermont, M P Robert
INTRODUCTION: Visual snow is a symptom described by some patients and poorly recognized by ophthalmologists. It consists in the permanent perception of a textured or a snowy vision, sometimes associated with palinopsia, exaggerated perception of the blue field entoptic phenomenon and photophobia. We report a group of patients suffering from visual snow in order to precise its characteristics and discuss its pathophysiology. MATERIALS AND METHODS: Prospective study of patients diagnosed between September 2010 and December 2012 with a visual snow phenomenon...
October 14, 2014: Journal Français D'ophtalmologie
S Praveen-Kumar, A Rajesh
No abstract text is available yet for this article.
October 2014: Clinical Neurology and Neurosurgery
David Gersztenkorn, Andrew G Lee
Palinopsia, the persistence or recurrence of visual images after the stimulus has been removed, is a nonspecific term that describes multiple types of visual symptoms with a wide variety of etiologies. For example, palinopsia may be the presenting symptom of a potentially life-threatening posterior cortical lesion, yet it may also be a benign medication side effect. We comprehensively review all published cases and subdivide palinopsia into two clinically relevant categories: illusory palinopsia and hallucinatory palinopsia...
January 2015: Survey of Ophthalmology
Hidetomo Murakami, Hiroo Ichikawa, Azusa Sugimoto, Akinori Futamura, Yuki Shimizu, Masayuki Sugie, Michael W Miller, Mitsuru Kawamura
A 49-year-old man with mitochondrial disease presented with visual allesthesia, a rare and puzzling phenomenon. He was admitted for treatment because of convulsions. After the convulsions ceased, he exhibited left homonymous hemianopsia. Brain diffusion-weighted magnetic resonance imaging (MRI) showed a high-intensity area in the right occipital lobe. Both the hemianopsia and the MRI activation in this area disappeared by day 36 of hospitalization. On the morning of day 57, right homonymous hemianopsia emerged in a singular manner...
2014: Neuropsychiatric Disease and Treatment
Christoph J Schankin, Farooq H Maniyar, Till Sprenger, Denise E Chou, Michael Eller, Peter J Goadsby
OBJECTIVE: To assess the relationship between the phenotype of the "visual snow" syndrome, comorbid migraine, and typical migraine aura on a clinical basis and using functional brain imaging. BACKGROUND: Patients with "visual snow" suffer from continuous TV-static-like tiny flickering dots in the entire visual field. Most patients describe a syndrome with additional visual symptoms of the following categories: palinopsia ("afterimages" and "trailing"), entopic phenomena arising from the optic apparatus itself (floaters, blue field entoptic phenomenon, photopsia, self-light of the eye), photophobia, nyctalopia (impaired night vision), as well as the non-visual symptom tinnitus...
June 2014: Headache
Laura Canafoglia, Michela Morbin, Vidmer Scaioli, Davide Pareyson, Ludovico D'Incerti, Valeria Fugnanesi, Fabrizio Tagliavini, Samuel F Berkovic, Silvana Franceschetti
We detail the phenotype of a novel form of neuronal ceroid lipofuscinosis due to a homozygous progranulin gene mutation (c.813_816del; CLN11 MIM #614706). The symptoms appeared in two young adult siblings, and included progressive retinopathy, recurrent generalized seizures, moderate ataxia, and subtle cognitive dysfunction. Long-lasting episodes of palinopsia were a recurring symptom and associated with polyphasic visual-evoked potential waveform that suggested hyperexcitability of the occipital cortex. Electroencephalography showed rare spike-wave paroxysms, and magnetic resonance imaging revealed selective cerebellar atrophy...
June 2014: Epilepsia
Christoph J Schankin, Farooq H Maniyar, Kathleen B Digre, Peter J Goadsby
Patients with 'visual snow' report continuous tiny dots in the entire visual field similar to the noise of an analogue television. As they frequently have migraine as a comorbidity with ophthalmological, neurological and radiological studies being normal, they are offered various diagnoses, including persistent migraine aura, post-hallucinogen flashback, or psychogenic disorder. Our aim was to study patients with 'visual snow' to characterize the phenotype. A three-step approach was followed: (i) a chart review of patients referred to us identified 22 patients with 'visual snow'...
May 2014: Brain: a Journal of Neurology
S J Stagno, T J Gates
The literature on palinopsia (visual perseveration) is reviewed, utilizing case reports of 46 patients who demonstrated this symptom. The most common etiologies for this symptom are space-occupying lesions, cerebral infarct, and seizure activity. The vast majority are due to central nervous system pathology occurring in the posterior (occipital or parieto-occipital) region, often in the right hemisphere. Proposed mechanisms for palinopsia are also discussed.
1991: Behavioural Neurology
Jane C Simpson, Peter J Goadsby, Prab Prabhakar
BACKGROUND: Migraine is a common neurological disorder affecting children, in which the headache is often preceded or accompanied by a complex of neurological symptoms known as an aura. Persistent visual symptoms are rare, with typical visual aura sometimes being poorly distinguished from other visual disturbances. METHODS: We describe the case of a 12-year-old girl who has experienced persistent, constant symptoms throughout the visual fields of white, bright, jagged spots and black and white flashes with sparkles and dots since May 2010...
November 2013: Pediatric Neurology
Fernando Sierra-Hidalgo, Eduardo de Pablo-Fernández
Palinopsia is an illusory visual phenomenon consisting in the persistence or recurrence of visual images after the exciting stimulus object has been removed. It has been reported in association with parietal and occipital lobe lesions, migraine auras, and related to the use of several drugs and illicit drugs. Here, we report the case of a 23-year-old woman with a 4-year history of episodic migraine with aura who developed palinopsia during sequential prophylactic therapies with topiramate and zonisamide. Although the exact physiopathology of this phenomenon remains unknown, topiramate- and zonisamide-induced palinopsia support an increase on serotonergic activity as a possible mechanism for this visual disorder...
March 2013: Clinical Neuropharmacology
Mohammed Ziaei, Mostafa A Elgohary, Fion D Bremner
A 37-year old general practitioner thought to be in good health presented to the ophthalmology department with palinopsia, headaches and transient visual obscurations. A CT scan revealed a large destructive lesion centred on the occiput and stealth guided excisional biopsy of the occipital lesion showed diffuse large B cell, Non-Hodgkin's lymphoma (NHL) infiltration. To the best of our knowledge this is only the second report of a patient with NHL presenting with palinopsia.
October 2013: International Ophthalmology
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