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Why does the Moorfields classification change if I modify the contour line?

April 26, 2017Classification Contour line moorfields

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Why does the Moorfields classification change if I modify the contour line?

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The Moorfields classification is based on a linear regression analysis between the optic disc area and the log of the neuro-retinal rim. Since the disc area is the area within the contour-line, adjusting the contour line changes the disc area.