Related Experiment Videos
Abnormal dark-adapted electroretinogram in Best's vitelliform macular degeneration
P Lachapelle1, M G Quigley, R C Polomeno
1Department of Ophthalmology, McGill University, Montreal Children's Hospital.
Summary
Best's vitelliform macular degeneration (BVMD) typically presents with normal electroretinogram (ERG) and abnormal electro-oculogram (EOG). This study details a patient with BVMD exhibiting an unusual, markedly abnormal dark-adapted ERG.
Area of Science:
- Ophthalmology
- Medical Genetics
- Neuroscience
Background:
- Best's vitelliform macular degeneration (BVMD) is a genetic macular dystrophy.
- Classic BVMD presentation includes normal electroretinogram (ERG) and abnormal electro-oculogram (EOG).
Observation:
- A patient suspected of having BVMD presented with atypical clinical findings, family history, and EOG results.
- This patient exhibited a markedly abnormal dark-adapted ERG, contrary to the typical presentation.
Findings:
- The abnormal dark-adapted ERG findings were also observed in the patient's daughter, who had typical vitelliform lesions.
- Specific segments of the ERG signal and oscillatory potentials showed a substantial decrease in amplitude, while temporal features were preserved.
Implications:
- This case highlights the variable expressivity and reduced penetrance of BVMD.
- The findings suggest that abnormal ERG can occur in BVMD, challenging established diagnostic criteria.
- Further research is needed to understand the genetic basis and clinical spectrum of BVMD.