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The familial contribution to non-syndromic ocular coloboma in south India
  1. S J Hornby1,
  2. L Dandona2,
  3. R B Jones3,
  4. H Stewart4,
  5. C E Gilbert1
  1. 1Department of Epidemiology and International Eye Health, Institute of Ophthalmology, London, UK
  2. 2International Centre for the Advancement of Rural Eye Care, LV Prasad Eye Institute, LV Prasad Marg, Banjara Hills, Hyderabad 500034, India
  3. 3Department of Paediatrics, Moorfields Eye Hospital, City Road, London, UK
  4. 4Department of Medical Genetics, Churchill Hospital, Oxford
  1. Correspondence to: Miss Stella Hornby, Department of Epidemiology and International Eye Health, Institute of Ophthalmology, 11–43 Bath Street, London EC1V 9EL, UK; stella.hornby{at}


Aims: To identify the proportion of familial cases of isolated ocular colobomatous malformations in a case series from south India.

Methods: Children with ocular coloboma without systemic features were recruited from multiple sources in Andhra Pradesh, India. Their families were traced, pedigrees drawn, and family members examined.

Results: 56 probands, 25 females (44.6%) and 31 males (57.4%) with a colobomatous malformation were identified. In 12 cases (21.4%) another family member was affected. The risk to siblings was 3.8%. The parents were consanguineous in 25 cases (44.6%).

Conclusions: 21.4% of cases of isolated ocular coloboma in this highly consanguineous population of south India were familial, with both autosomal dominant and autosomal recessive mechanisms likely in different families.

  • coloboma
  • aetiology
  • genetics
  • India

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