Gietzelt C, et al. - Authors evaluated the effect of trabeculectomy for glaucoma on morphometric neuroretinal parameters of the optic nerve head (ONH) using spectral domain optical coherence tomography (SD-OCT). Bruch’s membrane opening-based parameters were markedly influenced by structural reversal of disc cupping after trabeculectomy for up to more than 1 year. Seemingly, an association between the improvement in morphometry and the reduction of IOP was noted, whilst visual field function appears to be uninfluenced. In the longitudinal follow-up of glaucoma patients by SD-OCT, the reflection of the bias caused by surgery was necessitated by the evaluation of BMO-based parameters.