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Glaucoma detection using different Stratus optical coherence tomography protocols.

Jesper Leth Hougaard1, Anders Heijl, Boel Bengtsson

  • 1Department of Clinical Sciences, Ophthalmology, Malmö University Hospital, Lund University, Malmö, Sweden. jesper.hougaard@med.lu.se

Acta Ophthalmologica Scandinavica
|March 9, 2007
PubMed
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Different Stratus optical coherence tomography (OCT) scanning protocols for retinal nerve fibre layer (RNFL) thickness showed similar diagnostic accuracy for detecting early glaucoma. High-resolution and sector scans performed comparably to standard methods.

Area of Science:

  • Ophthalmology
  • Medical Imaging

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Early detection of glaucomatous damage to the retinal nerve fibre layer (RNFL) is crucial for timely intervention.
  • Optical coherence tomography (OCT) is a key technology for measuring RNFL thickness.

Purpose of the Study:

  • To compare the diagnostic accuracy of various Stratus OCT scanning protocols for RNFL thickness measurement.
  • To evaluate the impact of image resolution and scan type (full circle vs. sector) on diagnostic performance.

Main Methods:

  • Prospective analysis of Stratus OCT data from 90 healthy subjects and 62 glaucoma patients.
  • Utilized four RNFL thickness protocols varying in image resolution and scan number.
  • Calculated sensitivity and specificity using age- and refractive error-corrected cut-off levels.

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Main Results:

  • High-resolution and regular-resolution images demonstrated comparable diagnostic accuracy.
  • A single best-quality scan was as effective as the average of three scans.
  • Full circle RNFL thickness measurements showed similar or superior accuracy compared to sector analyses.
  • Sensitivities ranged from 84% to 87%, and specificities from 89% to 93% for full circle scans.

Conclusions:

  • The diagnostic capabilities of different Stratus OCT RNFL protocols are very similar for distinguishing early glaucoma from healthy eyes.
  • No significant difference in diagnostic accuracy was observed between high- and regular-resolution protocols.
  • Global (full circle) and localized (sector) OCT parameters yielded comparable diagnostic performance, suggesting diffuse RNFL damage in early glaucoma.