Song MK, Shin JW, Jo Y, et al. - Researchers used a broken-stick model to determine the tipping point at which peripapillary vessel density (pVD), measured utilizing optical coherence tomography angiography (OCT-A), is correlated with detectable visual field (VF) loss in cases of open-angle glaucoma (OAG). In 166 healthy Koreans participants, those with suspected glaucoma and patients with early-stage OAG, peripapillary retinal nerve fibre layer (pRNFL) thickness and pVD were measured using OCT and OCT-A. There is no tipping point in the link between pVD and VFS. This implies that even at the early stage of glaucoma, the association between pVD-VFS may be linear and stronger than that of pRNFLT-VFS.