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Sullivan-Mee et al questioned whether our longitudinal results demonstrating a relationship between lower corneal hysteresis (CH) and faster progression in glaucoma could perhaps be confounded by a relationship between CH and disease severity. They suggest that the longitudinal, mixed-effects model presented in our study should have included an adjustment for disease severity as a baseline covariate. As stated in our study, an unstructured covariance between random effects was assumed, allowing for correlation between random intercepts (baseline) and slopes. This was done exactly for the fact that rates of visual field loss (Read more...)

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