palinopsia

BACKGROUND: Several types of visual illusions can occur in Parkinson's disease (PD). However, the prevalence and types of specific illusions experienced by patients with PD remain unclear. This study aimed to investigate the types of illusions. METHODS: A questionnaire of visual illusions was developed through a literature review in consultation with clinicians and neurologists. Based on the questionnaire, 40 consecutive patients with PD were asked a series of Yes/No questions regarding 20 types of visual illusions since the onset of PD...

Ischemic stroke in the Posterior Cerebral Artery (PCA) territory is an uncommon entity. Majority present with visual field defects while isolated visual perceptual abnormalities are an exceptional manifestation. About 60 year old hypertensive patient presented with vague symptoms of blurring of vision and palinopsia. Defective color vision was recorded in superior quadrants. Perimetry revealed bilateral congruous left superior quadrantanopia. Magnetic Resonance Imaging (MRI) disclosed right PCA infarct involving occipito-temporal region...

Background: There are few reported cases of posterior reversible encephalopathy syndrome (PRES) combined with essential thrombocythemia (ET). We report a case of PRES-like syndrome in ET. Case Report: A 60-year-old man with a history of hypertension and thrombocythemia presented with progressive visual loss after waking up; and neurological examination showed pupils were 3 mm and equally reactive to light, which suggested cortical blindness. Brain magnetic resonance imaging (MRI) revealed restricted diffusion in diffusion-weighted imaging (DWI) in the bilateral parietal and occipital lobes...

A 59-year-old man presented with non-fluent aphasia and behavioral variant frontotemporal lobe degeneration (FTD), volunteered unusual visual symptoms that were best described as illusory visual spread (the image spreading over a larger area). This type of visual hyperfunction, related to the palinopsia syndromes, has not been reported in association with FTD. The syndrome may be best understood in terms of a visual variant of the environmental dependency syndrome, akin to the verbal variant of forced hyperphasia syndrome...

INTRODUCTION: Visual snow syndrome (VSS) is a central nervous system disorder that consists of the constant perception of small black and white dots throughout the entire visual field. DEVELOPMENT: VSS can present from infancy to old age, with greater prevalence in the young population, and shows no difference between sexes. The diagnostic criteria include the presence of visual snow and such other visual phenomena as palinopsia, photophobia, nyctalopia, and other persistent visual phenomena...

Background and Purpose: Visual Snow (VS) is a disorder characterised by the subjective perception of black-and-white visual static. The aetiology of this condition is not known. In our previous work we suggested that there is a link between short-wave (S or "blue" cone) signals and severity of visual snow symptoms. Therefore we aimed to further characterise this potential link. Methods: Patients ( n = 22) with classic VS based on the diagnostic criteria and healthy controls ( n = 12), underwent Intuitive Colorimetry (IC) testing (Cerium Visual Technologies)...

BACKGROUND: The majority of antidepressants inhibit serotonin reuptake and include the selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and the serotonin reuptake inhibiting tricyclic antidepressants. OBJECTIVE: The objective of this study was to investigate and describe the range and impact of reported adverse visual effects linked to serotonin reuptake inhibiting antidepressants. METHODS: Using data from a global database of patient spontaneous reports of drug adverse events, we systematically identified eligible reports of visual problems linked to the use of serotonin reuptake inhibiting antidepressants...

BACKGROUND AND PURPOSE: The full spectrum of neurological sequelae in COVID-19 is beginning to emerge. SARS-CoV-2 has the potential to cause both direct and indirect brain vascular endothelial damage through infection and inflammation that may result in long-term neurological signs and symptoms. We sought to illuminate persistent neuro-ophthalmological deficits that may be seen following posterior reversible encephalopathy syndrome (PRES) due to COVID-19. METHODS: We identified three individuals with PRES due to COVID-19 in our hospital system...

We present a 54-year-old male garbage collector, who came to the ophthalmology department due to one-month history of bilateral blurred vision, palinopsia, headache and visual geometrical hallucinations. The examination showed a normal anterior segment, a homonymous left upper central scotoma and tilted segmental hypoplasia of the optic nerve of the left eye. Contrast-enhanced brain magnetic resonance imaging showed a mass lesion in the right occipital cortex. At biopsy, tuberculosis was found. Subsequently, anti-tuberculous treatment led to a good response with resolution of the palinopsia and visual hallucinations, and improved vision...

Palinopsia in migraine has been reported recently, which may be due to the dysexcitability of visual cortical neurons. In this cross-sectional study, we report the correlation of neuronal dysexcitability with palinopsia using pattern shift visual evoked potential (PSVEP) in 91 migraineurs and 25 healthy controls. The presence of palinopsia was evaluated using a novel objective method, and revealed more frequent palinopsia in the migraineurs compared to the controls (53 of 91 [58.2%] vs 3 of 25 [12%]; P  < ...

Palinopsia refers to the abnormal persistence, or recurrence, of visual images after a visual stimulus has subsided. We describe here a case of palinopsia accompanied by a visual motion perception disorder as manifested by moving afterimages. A 71-year-old man presented to us after having experienced acute-onset, vivid, visual hallucinations for 1 week. A detailed history revealed that he was hallucinating multiple living and nonliving objects. He also complained of a persistence of afterimages, particularly in the left visual field...

No abstract text is available yet for this article.

BACKGROUND AND PURPOSE: The findings of ophthalmic examinations have not been systematically investigated in visual snow syndrome. This study reviewed the abnormal neuro-ophthalmologic findings in a patient cohort with symptoms of visual snow syndrome. METHODS: We retrospectively reviewed 28 patients who were referred for symptoms of visual snow to a tertiary referral hospital from November 2016 to October 2019. We defined the findings of best corrected visual acuity (BCVA), visual field testing, pupillary light reflex, contrast sensitivity, full-field and multifocal electroretinography, and optical coherence tomography...

BACKGROUND: Visual snow syndrome is a debilitating disorder characterized by tiny flickering dots (like TV static) in the entire visual field and a set of accompanying visual (palinopsia, enhanced entoptic phenomena, photophobia, nyctalopia), nonvisual (e.g. tinnitus) and nonperceptional (e.g. concentration problems, irritability) symptoms. Its pathophysiology is enigmatic and therapy is often frustrating. OBJECTIVES: To summarize our current understanding of pathophysiology and treatment of visual snow syndrome...

No abstract text is available yet for this article.

BACKGROUND: Visual snow syndrome (VSS) is a neurological condition characterized by persistent flickering dots in the visual fields, palinopsia, enhanced entoptic phenomenon, photophobia, and nyctalopia. Neuroimaging evidence supports the role of the visual association cortex in visual snow syndrome. Case series: We provided clinical care to three patients with visual snow syndrome, in whom [123 I]-IMP single-photon emission computed tomography (SPECT) imaging was performed. Case 1 was a 21-year-old male with a past history of migraine with aura who exhibited visual snow and entoptic phenomenon...

BACKGROUND AND PURPOSE: Visual snow manifests as a pan-field, dynamic visual disturbance described as continuous television static-like tiny flickering dots. Current diagnostic criteria further require at least two additional symptoms for visual snow syndrome (VSS) from: palinopsia (afterimages and trailing); entoptic phenomena (floaters, blue field entoptic phenomenon, photopsia, self-light of the eye); photophobia and nyctalopia. Our objective was to compare the phenotype of VSS in an Italian and British population...

Illusory visual phenomena, such as palinopsia, polyopsia or allesthesia, are rare manifestations of posterior cortical damage. Symptoms are characterized by illusory perceptions, ranging from isolated stationary objects to scenes and moving persons. Such illusions may appear while the original object is still in view, or become manifest with a delay and last for minutes, hours or even days. Some authors have suggested a disinhibited cortical response underlying visual illusions, but experimental studies supporting this hypothesis are lacking...

BACKGROUND: Heidenhain variant of Cruetzfeldt Jacob Disease is a rare phenotype of the disease. Early and isolated visual symptoms characterize this particular variant of CJD. Other typical symptoms pertaining to muti-axial neurological involvement usually appear in following weeks to months. Commonly reported visual difficulties in Heidenhain variant are visual dimness, restricted field of vision, agnosias and spatial difficulties. We report here a case of Heidenhain variant that presented with very unusual symptoms of palinopsia and oscillopsia...

Palinopsia is defined as persistence of recurrent visual images after the stimulus has been removed. A 55-year-old male patient with long-standing migraine history developed brain abscess in the right occipital lobe. The patient developed episodes of palinopsia accompanied with migraine attack after healing of occipital lesion. The phenomenon cannot be sufficiently explained with single risk factor, although occipital lesion and migraine are both known to cause palinopsia. We speculated that migrainous brain is not always symptomatic but may drive cortex sensitive for second insult, such as occipital brain lesion...