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Pattern-reversal visual-evoked potential in patients with occult macular dystrophy
Gen Hanazono1, Hisao Ohde, Kei Shinoda
1Department of Ophthalmology, National Institute of Sensory Organs, Tokyo, Japan.
Clinical Ophthalmology (Auckland, N.Z.)
|December 31, 2010
Summary
Pattern-reversal visual-evoked potentials (pVEPs) show delayed latency and reduced amplitude in occult macular dystrophy (OMD) patients. These findings highlight the central cone pathway
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Occult macular dystrophy (OMD) is a hereditary retinal condition.
- Characterized by normal fundus and full-field electroretinograms (ERGs).
- Patients experience progressive visual acuity loss and abnormal focal macular ERGs.
Purpose of the Study:
- To investigate pattern-reversal visual-evoked potential (pVEP) findings in OMD patients.
- To characterize electrophysiological abnormalities in OMD.
Main Methods:
- Reviewed pVEPs from four OMD patients (aged 42-61).
- Analyzed N-75 and P-100 amplitudes (P2 amplitude) and N-75 latency (N1 latency).
- Utilized varying checkerboard stimuli sizes (5', 10', 20', 40').
Main Results:
- Reduced mean P2 amplitude across all stimulus sizes.
- Delayed mean N1 latency across all stimulus sizes.
- Results compared to laboratory standards at Keio University Hospital.
Conclusions:
- pVEP abnormalities in OMD include delayed latency and reduced amplitude.
- Suggests a significant role of the central cone pathway in OMD.
- pVEPs may aid in diagnosing and understanding OMD.
