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Scientific correspondence
Variability across the optic nerve head in scanning laser tomography
  1. J C H Tan,
  2. D F Garway-Heath,
  3. R A Hitchings
  1. Moorfields Eye Hospital and Institute of Ophthalmology, London, UK
  1. Correspondence to: Professor R A Hitchings, Glaucoma Research Unit, Moorfields Eye Hospital, City Road, London EC1V 2PD, UK; roger.hitchings{at}virgin.net

Abstract

Aim: To characterise measurement variability in scanning laser tomography of the optic nerve head.

Methods: 21 normal and 21 glaucoma subjects underwent same and separate day test-retest Heidelberg retina tomograph imaging by the same and different operators.

Results: Rim area was most reproducible among parameters. Its variability tended to be highest temporally and increased (p<0.05) with testing involving different operators and visits. Nature of regional variability differed between glaucoma and normal eyes and between standard and 320 μm reference planes.

Conclusions: Rim area is reproducible and potentially useful as a marker of progression. Pattern of variability and the influence of different reference planes, disease, operators, and visits should be considered when evaluating progression.

  • optic nerve head
  • scanning laser tomography

https://doi.org/10.1136/bjo.87.5.557

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