Reproducibility of the optic nerve head topography with a new laser tomographic scanning device

Ophthalmology. 1994 Jun;101(6):1044-9. doi: 10.1016/s0161-6420(94)31220-6.


Background: Laser scanning tomography has been shown to be an accurate and reliable method for the assessment of the three-dimensional optic disc topography. The authors investigate the reliability of morphometric measurements with the Heidelberg retina tomograph, a new instrument which was designed based on this technology, which simplifies handling and is much smaller than the laser tomographic scanner.

Methods: Three independent measurements of the optic disc were performed in 39 eyes of 39 patients which were equally divided into the following three groups: glaucoma, glaucoma suspects, and controls.

Results: The mean coefficient of variation for measurement in the glaucoma, glaucoma suspect, and control groups was 2.9%, 5.0%, and 3.4%, respectively, for cup area; 4.9%, 4.6%, and 4.6%, respectively, for cup volume; 5.2%, 3.8% and 3.3%, respectively, for mean cup depth; and 5.2%, 4.1%, and 4.0%, respectively, for maximal cup depth. The mean standard deviation for one pixel of the total image was 30 +/- 6 microns, 28 +/- 7 microns, and 22 +/- 6 microns for the three groups, respectively.

Conclusion: The Heidelberg retina tomograph enables fast and reliable measurement of the optic disc topography and therefore may allow exact follow-up of patients.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Anthropometry
  • Evaluation Studies as Topic
  • Follow-Up Studies
  • Glaucoma / pathology*
  • Humans
  • Middle Aged
  • Ocular Hypertension / pathology
  • Optic Disk / pathology*
  • Reproducibility of Results
  • Tomography / instrumentation*