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Evaluation of visual pathways in multiple sclerosis. I. After-images compared to visual evoked potentials
Acta Neurologica Scandinavica
|September 1, 1986
Summary
The electronic flashlight (EFL) method shows promise for diagnosing visual impairment in multiple sclerosis (MS) patients, offering a better diagnostic tool than previous methods. While less sensitive than pattern reversal visual evoked potential (PR-VEP), EFL aids in detecting visual pathway changes.
Area of Science:
- Ophthalmology
- Neuroscience
- Clinical Neurology
Background:
- Visual impairment is a common symptom in multiple sclerosis (MS).
- Assessing visual pathway involvement is crucial for MS diagnosis and management.
- Previous methods for evaluating visual function in MS, such as the pocket flashlight (PFL) method, have shown limitations.
Purpose of the Study:
- To evaluate the diagnostic value of the flight of colours (FOC) phenomenon in 65 patients with multiple sclerosis (MS).
- To compare the efficacy of a novel electronic flashlight (EFL) method against the traditional pocket flashlight (PFL) method and pattern reversal visual evoked potential (PR-VEP).
- To assess the potential of the EFL method in reflecting disease activity and aiding in the monitoring of central visual pathway degeneration in MS.
Main Methods:
- Sixty-five patients diagnosed with multiple sclerosis (MS) were included in the study.
- The flight of colours (FOC) phenomenon was assessed using both a pocket flashlight (PFL) and a newly developed electronic flashlight (EFL) method.
- Results were compared with pattern reversal visual evoked potential (PR-VEP) findings.
Main Results:
- The electronic flashlight (EFL) method demonstrated significantly higher diagnostic accuracy (61% abnormal) compared to the pocket flashlight (PFL) method (18% abnormal).
- The EFL method showed lower sensitivity (61%) than pattern reversal visual evoked potential (PR-VEP) (80% abnormal).
- The EFL method identified 16 eyes with normal PR-VEP latency, suggesting it can complement PR-VEP in diagnosing visual pathway abnormalities in MS.
Conclusions:
- The electronic flashlight (EFL) method is a more effective diagnostic tool for evaluating visual impairment in multiple sclerosis (MS) than the pocket flashlight (PFL) method.
- The EFL method provides valuable information about the degree of degenerative changes in central visual pathways and may assist in monitoring MS disease activity.
- Further improvements to the EFL method could enhance its diagnostic potential in the context of multiple sclerosis.