Retinal degeneration in children: dark adapted visual threshold and arteriolar diameter

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Ronald M Hansen1, Susan E Eklund, Ilan Y Benador

  • 1Department of Ophthalmology, Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.

Vision Research
|September 4, 2007
PubMed

Insights

Children with retinal degeneration from Bardet-Biedl syndrome, Leber congenital amaurosis, and Usher syndrome show elevated dark-adapted visual thresholds. Narrowing arterioles correlate with vision loss, aiding disease monitoring.

Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Degeneration

Background:

  • Bardet-Biedl syndrome (BBS), Leber congenital amaurosis (LCA), and Usher syndrome (USH) are genetic disorders causing progressive retinal degeneration.
  • Understanding the natural history and progression of these conditions is crucial for developing effective treatments.
  • Non-invasive methods are needed to objectively assess retinal function and disease severity.

Purpose of the Study:

  • To evaluate the retinal condition in children diagnosed with BBS, LCA, or USH.
  • To measure dark-adapted visual thresholds (DAT) and retinal arteriolar diameters in these patients.
  • To investigate the relationship between DAT, arteriolar changes, and disease progression over time.

Main Methods:

  • Retrospective analysis of 41 children with BBS, 31 with LCA, and 13 with USH.
  • Measurement of dark-adapted visual threshold (DAT) at baseline and serially.
  • Assessment of retinal arteriolar diameters using non-invasive imaging techniques.

Main Results:

  • Elevated initial DATs were observed in 83 out of 85 patients compared to controls.
  • Significant progressive elevation of DAT occurred in 26 out of 62 patients with serial measurements.
  • Arteriolar diameters were significantly attenuated and narrowed with age in BBS and USH, but not LCA. Higher DATs correlated with narrower arterioles.

Conclusions:

  • Non-invasive measurements of DAT and arteriolar diameters can effectively document the natural history of retinal degeneration in BBS, LCA, and USH.
  • These methods show potential for monitoring disease progression and evaluating therapeutic responses in clinical trials.
  • The association between elevated DAT and arteriolar narrowing highlights a potential biomarker for disease severity.

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