You are here

Article Text

Article menu
Download PDFPDF
Clinical science
Scientific reports
Oligocone trichromacy: a rare and unusual cone dysfunction syndrome
  1. M Michaelides1,
  2. G E Holder2,
  3. K Bradshaw3,
  4. D M Hunt1,
  5. J D Mollon4,
  6. A T Moore1
  1. 1Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK
  2. 2Moorfields Eye Hospital, City Road, London EC1V 2PD, UK
  3. 3Department of Ophthalmology, Addenbrooke’s Hospital, Cambridge CB2 2QQ, UK
  4. 4Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK
  1. Correspondence to: Professor A T Moore Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK; tony.mooreucl.ac.uk

Abstract

Aim: To describe the phenotype of a case series of six patients with oligocone trichromacy.

Methods: The six affected individuals underwent an ophthalmological examination, electrophysiological testing and detailed psychophysical assessment.

Results: All six affected patients had a history of moderately reduced visual acuity (6/12 to 6/24) from infancy, not improved by full spectacle correction. They complained of mild photophobia and they were not aware of any colour vision deficiency. They had no nystagmus and fundi were normal. Electrophysiological testing revealed either absent/profoundly reduced cone flicker responses or preserved but delayed and mildly reduced flicker responses. Colour vision was found to be within normal limits, but some patients showed mildly elevated discrimination thresholds along all axes.

Conclusion: The largest case series to date of patients with oligocone trichromacy is presented. The electrophysiological findings suggest that there may be more than one disease mechanism. The mode of inheritance is likely to be autosomal recessive, and while previous reports have suggested that this disorder is stationary, in one of these families there is clinical evidence of progression.

  • oligocone trichromacy
  • cone dysfunction syndrome

https://doi.org/10.1136/bjo.2003.028142

Statistics from Altmetric.com

    Request Permissions

    If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

    View Full Text

    Footnotes