Venkatesh R, Pereira A, Aseem A, et al. - Researchers conducted this prospective, hospital-based cross-sectional study to examine the retinal vessel changes at peripapillary and parafoveal regions utilizing optical coherence tomography angiography in patients with varying obstructive sleep apnoea syndrome (OSAS) risk, identified by the STOP-BANG questionnaire. Based on the OSAS risk score, participants were divided into 3 groups. Using optical coherence tomography angiography, flow areas and vessel densities have been calculated at peripapillary and parafoveal regions. Six hundred and six eyes of 303 patients were involved in groups 1 (n = 96), 2 (n = 135) and 3 (n = 72). Findings suggested that the sleep apnoea questionnaire is an easy way to identify the disease severity stage but polysomnography is still the definitive gold standard. Optical coherence tomography angiography reveals some correlations with the severity of disease but it can not be used unambiguously to distinguish the severity of sleep apnoea.