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Related Experiment Videos

Macular flicker electroretinograms in Best vitelliform dystrophy

B Falsini1, V Porciatti, G Porrello

  • 1Eye Clinic, Catholic University Lgo F. Vito 1, 00168 Rome, Italy.

Current Eye Research
|June 1, 1996
PubMed
Summary

Best vitelliform macular dystrophy (BMD) shows early neurosensory retina dysfunction, with photoreceptor and postreceptoral abnormalities. Focal electroretinogram (FERG) analysis reveals progressive receptoral loss in BMD patients over time.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Best vitelliform macular dystrophy (BMD) is an inherited retinal disorder.
  • Macular dystrophies affect central vision, impacting photoreceptors and retinal pigment epithelium.
  • Focal electroretinogram (FERG) components reflect retinal function.

Purpose of the Study:

  • Evaluate neurosensory retina function in Best vitelliform macular dystrophy (BMD).
  • Utilize focal electroretinogram (FERG) fundamental and 2nd harmonic components to differentiate retinal activity.
  • Compare BMD findings with Stargardt macular dystrophy (STD) and healthy controls.

Main Methods:

  • Recorded focal electroretinograms (FERGs) using sinusoidal flicker stimuli at 8 Hz and 32 Hz.
  • Measured amplitudes and phases of FERG fundamental and 2nd harmonic components.

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  • Calculated the fundamental-to-2nd harmonic amplitude ratio as an index of relative functional changes.

    • Main Results:

    • BMD patients exhibited reduced FERG fundamental and 2nd harmonic amplitudes compared to controls.
    • An increased fundamental-to-2nd harmonic ratio was observed in BMD, suggesting postreceptoral involvement.
    • Stargardt macular dystrophy (STD) patients showed reduced amplitudes but a normal ratio, indicating primarily receptoral dysfunction.

    Conclusions:

    • BMD involves early neurosensory retinal abnormalities, including photoreceptor and postreceptoral dysfunction.
    • The elevated fundamental-to-2nd harmonic ratio in BMD distinguishes it from STD.
    • Progressive receptoral loss may occur in BMD over a medium-term follow-up period.