Related Experiment Videos
Pattern visual evoked potential in the diagnosis of functional visual loss
1Crippled Children Vitreoretinal Research Foundation and the University of Tennessee, Department of Ophthalmology, Memphis, Tennessee, USA.
Ophthalmology
|January 11, 2001
Summary
Pattern visual evoked potential (P-VEP) objectively predicts visual acuity (VA) in functional visual loss. This study found P-VEP to be a useful diagnostic tool for these conditions.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Electrophysiology
Background:
- Functional visual loss presents diagnostic challenges.
- Objective assessment of visual acuity (VA) is crucial for accurate diagnosis.
Purpose of the Study:
- To evaluate the utility of pattern visual evoked potential (P-VEP) in diagnosing functional visual loss.
- To compare P-VEP estimated acuity with subjective and best-performed VA.
Main Methods:
- Retrospective observational case series of 72 subjects with unexplained visual abnormalities.
- P-VEP testing was performed to estimate visual acuity.
- Comparison of P-VEP estimated acuity with initial subjective VA and best-performed VA.
Main Results:
- All 72 subjects with functional visual loss exhibited normal P-VEPs.
- A discrepancy of less than 3 lines of Snellen acuity between P-VEP and best-performed VA was observed in 87.5% of subjects.
- A significant discrepancy was noted in six subjects with vision loss of unknown or injury-related origin.
Conclusions:
- Pattern visual evoked potential (P-VEP) provides an objective measure of visual acuity.
- P-VEP is a valuable and objective diagnostic test for functional visual loss.