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High-resolution optical coherence tomography demonstration of membranes spanning optic disc pits and colobomas
  1. E Doyle,
  2. D Trivedi,
  3. P Good,
  4. R A Scott,
  5. G R Kirkby
  1. Birmingham and Midland Eye Centre, Birmingham, UK
  1. Mr E Doyle, Birmingham and Midland Eye Centre, City Hospital, Dudley Road, Birmingham B18 7QH, UK; edrachie{at}


Objectives: To demonstrate the features of optic disc pits and colobomas revealed by high-resolution optical coherence tomography (OCT) and their association with the development of maculopathy.

Methods: Subjects with disc pits or colobomas and no other ocular history underwent full ophthalmic examinations including logMAR visual acuity and contrast sensitivity. Fundus photographs and high-resolution OCT images were obtained.

Results: Seven patients were identified with optic disc pits or colobomas aged 25 to 63 years. Five patients had a unilateral optic disc pit, one had a unilateral disc coloboma, and another had bilateral disc colobomas. Apart from one eye with a grossly anomalous disc, vision was logMAR 0.4 or better in all eyes. In three of five eyes without maculopathy, a complete membrane could be identified traversing the optic disc cup that was absent or deficient in the three eyes with maculopathy. One patient with optic disc pit and marked schisis-like separation of the retinal layers throughout the macula was asymptomatic with logMAR visual acuity of 0.0 and normal achromatic contrast sensitivity.

Conclusions: In this small series of patients with optic disc pits or colobomas, it was possible to identify a membrane spanning the optic disc cup, and it is speculated that this may protect against the development of maculopathy. Schisis-like separation of retinal layers can be associated with normal visual function.

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  • Competing interests: None.

  • Ethics approval: Ethics approval was provided by the Sandwell and West Birmingham Research Ethics Committee.

  • Patient consent: Obtained.