Artikel
10-year-results: Detection of long-term progressive optic disc changes using confocal laser tomography
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Autoren
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H. Mueller
- University of Freiburg, Department of Ophthalmology, Freiburg
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A. Unsöld
- University of Freiburg, Department of Ophthalmology, Freiburg
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P. Maier
- University of Freiburg, Department of Ophthalmology, Freiburg
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S. Walter
- Eye Clinic Augsburg, Augsburg
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J. Funk
- University of Freiburg, Department of Ophthalmology, Freiburg
| Veröffentlicht: | 22. September 2004 |
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Gliederung
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Objective
The detection of a slowly progredient loss of optic nerve fibres in patients with ocular hypertension is an important task in confocal laser tomography. We compared changes of the parameters of the Heidelberg Retina Tomograph with changes of static visual field measurements.
Methods
Since 1994, patients with ocular hypertension have been monitored prospectively. On average, every six months visual field measurements (Octopus 123, dG1x) as well as optic disc examinations using the HRT were performed. A progredient excavation of the optic nerve head was defined as an increasing or decreasing cohort of straight lines of the 66%-confidence interval of the linear regression line. We analysed the HRT-parameter Cup Area (CA), Cup Volume (CV), Cup Shape Measure (CSM) and Contour Height Variation (CHV) for the total disc and for six different sectors in 105 eyes (51 patients). A glaucomatous visual field defect and therewith the conversion from ocular hypertension (OHT) to open angle glaucoma (OAG) was defined by the appearance of a reproducible defect-cluster > 20 dB of two or three adjacent points.
Results
Ten of 105 eyes converted from OHT to OAG. A significant linear increase of the global parameters occurred in 2 (CA), 4 (CSM), 1 (CV) and a decrease in 2 (CHV) eyes. The sectoral analysis improved the results of cup area and cup volume in the temporal superior and temporal inferior sectors (ts/ti): 5/4 (CA), 2/3 (CV). Cup shape measure showed slightly increased hits in the temporal superior, nasal (n) and nasal inferior (ni) sectors (5(ts), 6(n) 5(ni)).
Conclusions
The linear model for the progression of the optic disc parameters detected only a small amount of the converters. The hit rate could be increased with the sector based analysis. Cup shape measure showed the highest hit rate.
