Normal sensory and absent cognitive electrophysiological responses in functional visual loss following chemical eye burn
Language English Country Netherlands Media print-electronic
Document type Case Reports, Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Burns, Chemical physiopathology MeSH
- Adult MeSH
- Electroretinography MeSH
- Cognition Disorders physiopathology MeSH
- Humans MeSH
- Eye Burns chemically induced MeSH
- Vision Disorders physiopathology MeSH
- Prospective Studies MeSH
- Retina physiology MeSH
- Sensory Thresholds physiology MeSH
- Visual Field Tests MeSH
- Visual Acuity physiology MeSH
- Visual Fields MeSH
- Evoked Potentials, Visual physiology MeSH
- Check Tag
- Adult MeSH
- Humans MeSH
- Male MeSH
- Publication type
- Journal Article MeSH
- Case Reports MeSH
- Research Support, Non-U.S. Gov't MeSH
OBJECTIVE: To present a unique case of a 34-year-old patient with unilateral functional visual loss after chemical burn with normal visual evoked potentials (VEPs) and absent cognitive response (P300 wave). METHODS: Visual functions, complete ophthalmic and neurologic examinations including computed tomography of the brain, electrophysiological testing of the visual pathway up to the cognitive brain cortex were evaluated. Data were collected prospectively during 1-year follow-up and compared with data from published case series and a literature review. RESULTS: No abnormalities were found that could account for such a rapid monocular loss of vision with exception of absence of the P300 wave in the affected eye during cognitive tasks. Vision slowly improved during 1 year without any treatment. CONCLUSIONS: Functional vision loss is a diagnosis of exclusion. In the event of reduced vision in the context of a normal ocular health examination, all other pathology must be ruled out before the diagnosis of functional visual loss is established. Complex visual electrophysiological testing is the preferred tool for objective examination of such disorders.
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