Minimum rim width has been adapted by recent OCT devices since it takes more into account variability of the entry of the RNFL axons into the optic nerve canal
The BMO MRW concept was first shown to have the best diagnostic performance to differentiate glaucomatous from non glaucomatous eyes on the Spectalis platform by Reis ASC, O’Leary N, Yang H, et al. Influence of Clinically Invisible, but Optical Coherence Tomography Detected, Optic Disc Margin Anatomy on Neuroretinal Rim Evaluation. Investigative Ophthalmology & Visual Science. 2012;53(4):1852-1860. doi:10.1167/iovs.11-9309 and in Chauhan BC,, O'Leary N,, Almobarak FA,, et al. Enhanced detection of open-angle glaucoma with an anatomically accurate optical coherence tomography-derived neuroretinal rim parameter. Ophthalmology. 2013; 120: 535-543
For the Cirrus OCT, the MRW is estimated over a continuum as data points are pulled from the data cube. The Cirrus OCT fits a plane to the BMO surface and uses that plane to characterize and correct for how the optic nerve is tilted relative to the retinal surface. Also, the Cirrus corrects for disc size when comparing ONH measurements to normative limits.
It is available from Cirrus OCT model 400 and 4000 (software version 5.0 onwards)
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