Evidence map›Paper›PMID 33029971›Full record

ArticleJournal of clinical neurology (Seoul, Korea)2020

Neuro-ophthalmologic Findings in Visual Snow Syndrome.

Yung Ju Yoo, Hee Kyung Yang, Jeong Yoon Choi, Ji Soo Kim, Jeong Min Hwang

Open access · diamondAbstract read
In one paragraph

Article in Journal of clinical neurology (Seoul, Korea), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 1 pooled it
3.0field-weighted citation impact, top 8% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 1 synthesis or guideline pooled it, 38 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Neuro-ophthalmic findings of Visual Snow Syndrome in Korea.Japanese journal of ophthalmology · 2025
    Article
  5. Review
  6. Review
  7. Article
  8. Article
  9. Review
  10. Visual Snow: Updates and Narrative Review.Current pain and headache reports · 2024
    Review
  11. Article
  12. Adapting to Visual Noise Alleviates Visual Snow.Investigative ophthalmology & visual science · 2023
    Article
  13. Review
  14. Review
  15. Article
  16. Review
  17. Review
  18. Article
  19. Diagnostic Evaluation of Visual Snow.Frontiers in neurology · 2021
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 1 country.

Yung Ju Yoo *Department of Ophthalmology, Kangwon National University Graduate School of Medicine, Kangwon National University Hospital, Chuncheon, Korea.ORCID https://orcid.org/0000-0001-8045-0391
Hee Kyung Yang *Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.ORCID https://orcid.org/0000-0002-1140-6036
Jeong Yoon ChoiDepartment of Neurology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.ORCID https://orcid.org/0000-0003-2159-9967
Ji Soo KimDepartment of Neurology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.ORCID https://orcid.org/0000-0002-1508-2024
Jeong Min HwangDepartment of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea. hjm@snu.ac.kr.ORCID https://orcid.org/0000-0003-0837-2864
Seoul National University Bundang Hospital · KRKangwon National University Hospital · KR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

background and purposeThe 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.

methodsWe 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.

resultsTwenty patients (71%) were finally diagnosed as visual snow syndrome. Their additional visual symptoms included illusionary palinopsia (61%), enhanced entoptic phenomenon (65%), disturbance of night vision (44%), and photophobia (65%). A history of migraine was identified in ten patients (50%). The mean BCVA was less than 0.1 logarithm of the minimum angle of resolution, and electrophysiology showed normal retinal function in all patients. Contrast sensitivity was decreased in two of the seven patients tested. Medical treatment was applied to five patients which all turned out to be ineffective. Among the eight patients who were excluded, one was diagnosed with rod-cone dystrophy and another with idiopathic intracranial hypertension.

conclusionsNeuro-ophthalmologic findings are mostly normal in patients with visual snow syndrome. Retinal or neurological diseases must be excluded as possible causes of visual snow.

Indexed as

cortical excitabilityelectrophysiological phenomenamigraineoptical coherence tomographyvisual snow

Identifiers

PMID33029971
PMCPMC7541978
OpenAlexW3091269166

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.