Researchers described a case of visual snow syndrome in a 32-year-old male patient with persistent visual disturbances despite normal neuro-ophthalmologic findings, suggesting a central neurologic origin of the condition.
The patient, a medical resident, reported more than 12 months of continuous “TV-static”–like visual disturbance affecting the entire visual field, accompanied by palinopsia, photophobia, nyctalopia, and tinnitus. Symptom onset was sudden following a viral infection and a period of severe academic stress. He reported no history of migraine, head trauma, or hallucinogen use, although family history included migraine and personal history included anxiety and tinnitus.
Ophthalmologic examination showed normal visual acuity of 20/20 bilaterally and no abnormalities of the anterior segment, fundus, or optic nerve. Structural testing, including optical coherence tomography, optical coherence tomography angiography, and ocular ultrasound, confirmed bilateral posterior vitreous detachment without additional pathologic findings. Automated perimetry demonstrated a normal visual field profile in the right eye and localized sensitivity fluctuations in the left eye within normal limits for the limits.
Brain computed tomography showed no structural abnormalities. Magnetic resonance imaging was not performed. Additional testing showed preserved retinal and vascular structures. Posterior vitreous detachment was considered insufficient to explain the patient's symptoms, supporting exclusion of major structural retinal and optic nerve causes, with central mechanisms considered more likely.
The patient met International Classification of Headache Disorders (ICHD-3) criteria for visual snow syndrome, including continuous visual static for more than 3 months and associated symptoms of palinopsia, photophobia, nyctalopia, and enhanced entoptic phenomena.
The report notes that migraine occurs in 50% to 72% of patients with visual snow syndrome, tinnitus in 62% to 75%, and anxiety or depressive disorders in up to 35%.
Proposed mechanisms include cortical hyperexcitability and thalamocortical dysrhythmia, which may impair sensory filtering and allow perception of normally suppressed visual stimuli.
The patient received escitalopram 10 mg daily for comorbid anxiety, along with lifestyle modifications including caffeine cessation, regular exercise, and use of photochromic lenses. He reported subjective improvement in visual static intensity after one month, reaching a severity score of 8 out of 10. Adverse effects included sleep disturbance, vivid nightmares, and decreased libido.
This response differs from prior data cited in the report, which indicate selective serotonin reuptake inhibitors are typically ineffective or worsen symptoms, with improvement reported in 6% to 7% of patients. Other therapies include lamotrigine, with partial efficacy in approximately 61% of patients, and benzodiazepines, with partial relief in approximately 71%. Nonpharmacologic approaches such as colored filter lenses and cognitive behavioral therapy are also described as reducing symptom burden.
The case also described pulse-synchronous modulation of visual static, in which symptom intensity fluctuated with the patient’s arterial pulse during tachycardia, suggesting a potential association between autonomic activity and visual perception.
Visual snow syndrome is defined by persistent dynamic visual noise across the visual field with associated visual symptoms and absence of an alternative diagnosis. The researchers emphasized that structural testing is typically normal despite persistent symptoms.
“VSS represents a clinical continuum where structural normalcy masks profound functional disability,” wrote lead study researcher Francisco Dacarett of Santa Lucía Hospital, Clinic and Optician in Tegucigalpa, Honduras, and colleagues.
The researchers reported no conflicts of interest.
Source: Scientific Research
