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Related Experiment Video

Updated: May 7, 2026

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EOG and the En-Face Inner Segment/Outer Segment-Ellipsoid Complex Image in Multiple Evanescent White Dot Syndrome.

Fubin Wang1, Aijun Wang1, Xiaoyan Leng1

  • 1Department of Ophthalmology, Shanghai Bright Eye Hospital, Shanghai, People's Republic of China.

International Medical Case Reports Journal
|June 19, 2024
PubMed
Summary

This study highlights a rare case of Multiple Evanescent White Dot Syndrome (MEWDS) with unusual electrooculogram (EOG) results and distinct en-face imaging findings. These advanced imaging techniques may offer new insights into the pathogenesis of MEWDS.

Keywords:
EOGinner segment/outer segment-ellipsoid complexminimum intensity projectionmultimodal imagingmultiple evanescent white dot syndrome

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Retinal Diseases

Background:

  • Multiple Evanescent White Dot Syndrome (MEWDS) is an idiopathic inflammatory condition affecting the outer retina.
  • Typical diagnostic methods include fundus photography, autofluorescence, and OCT, but atypical findings necessitate advanced imaging.
  • Electrooculogram (EOG) assesses retinal pigment epithelium and photoreceptor function, with Arden ratio being a key metric.

Observation:

  • A 25-year-old female presented with acute, painless visual impairment and photopsia in the right eye.
  • Multimodal imaging revealed multifocal white spots, foveal granularity, and hyperautofluorescence in the affected eye.
  • Spectral-domain Optical Coherence Tomography (SD-OCT) showed disruption of the ellipsoid zone and photoreceptor outer segments.

Findings:

  • En-face imaging, specifically minimum intensity projection (Min-IP) and inner segment/outer segment-ellipsoid complex, revealed hyperreflective spots in the affected eye.
  • Interestingly, similar hyperreflective spots were noted in the fellow eye on en-face imaging of the inner segment/outer segment-ellipsoid complex.
  • Atypical EOG findings were observed, with an Arden ratio of 2.5 in the right eye and 1.7 in the left eye.

Implications:

  • En-face imaging of the inner segment/outer segment-ellipsoid complex demonstrates aberrant features in MEWDS, potentially extending to the fellow eye.
  • The observed abnormalities in en-face imaging and EOG warrant further investigation into the pathogenesis of MEWDS.
  • These advanced imaging techniques may provide novel insights into the pathophysiology and diagnostic criteria for MEWDS.