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Related Experiment Videos

Optic disc duplication or coloboma?

N Islam1, J Best, J S Mehta

  • 1Medical Retina, Moorfields Eye Hospital, City Road, London EC1V 2PD, UK. isniaz@yahoo.com

The British Journal of Ophthalmology
|December 24, 2004
PubMed
Summary
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Lesions mimicking optic disc duplication were identified as peripapillary chorioretinal coloboma. These cases presented with unusual visual field defects, including double blind spots, highlighting the importance of careful clinical examination.

Area of Science:

  • Ophthalmology
  • Optic Nerve Imaging
  • Visual Field Analysis

Background:

  • Optic disc duplication is a rare condition.
  • Accurate diagnosis is crucial to avoid unnecessary investigations.

Purpose of the Study:

  • To describe lesions resembling optic disc duplication.
  • To highlight their associated unusual visual fields.
  • To report the first case of pseudo-duplication with overlying retinal nerve fibre layer.

Main Methods:

  • Retrospective, non-comparative review of case notes.
  • Humphrey visual fields and OCT-3 imaging were utilized.

Main Results:

  • Eleven cases of peripapillary chorioretinal coloboma were identified.

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  • Lesions were located superior to the optic disc in some cases.
  • Automated visual field testing demonstrated double blind spots or superior hemifield defects.

    • Conclusions:

    • Clinical examination is key to differentiating true optic disc duplication from coloboma.
    • Identifying bridging retinal vessels aids in diagnosis.
    • Proper diagnosis can prevent unnecessary invasive and non-invasive investigations.