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BACKGROUND: The latest approach to diagnosing glaucoma by high resolution spectral domain optical coherence tomography (SD-OCT) is to assess the minimal rim width (MRW) of the retinal nerve fiber layer (RNFL) at the Bruch's membrane opening (BMO) in the optic disk margin. OBJECTIVE: This study was carried out to evaluate if this new parameter allows a more precise detection of glaucomatous damage to the RNFL. METHODS: This article presents clinical examples and differences in the measurement methods in glaucoma cases. RESULTS: The main advantage is the automated detection by software allowing precise landmark tracking and coherent follow-up investigations. There seem to be considerable differences between the funduscopically assumed margin and the detection of the margin by the new software. Likewise there is a difference between RNFL measurements taken at the BMO and the peripapillary scan by SD-OCT. DISCUSSION: Ongoing research should assess the potential of this new parameter for a more precise detection of nerve fiber defects and changes over time compared to other imaging techniques.
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6.9.2.2 Posterior (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis > 6.9.2 Optical coherence tomography)