To assess polycythaemia vera (PV)-related retinal microvascular morphological changes using optical coherence tomography angiography (OCTA). Material and Methods: In this cross-sectional case-control study, 30 PV patients (Group 1) and 30 healthy individuals (Group 2) underwent a comprehensive ophthalmological examination, followed by OCTA acquisition in Angio Retina mode (6x6 mm). Macular superficial and deep vascular plexus vessel densities (VDs) in foveal, parafoveal, and perifoveal, as well as foveal avascular zone (FAZ) area, FAZ perimeter, and foveal VD in 300-µm wide region around FAZ (FD-300) were automatically analysed using AngioVue Analytics software. Sequential measurements were compared for statistical significance. Results: Mean ages were 46.97±3.20 and 47.42±2.55 years in Groups 1 and 2, respectively (p=0.350). Group 1 had significantly increased superficial foveal VD than Group 2 (p=0.032). Besides, Group 1 had non-significantly increased VDs than Group 2 in the following areas: superficial whole (p=0.468), superficial parafoveal (p=0.692), deep foveal (p=0.752), deep perifoveal (p=0.369), FAZ perimeter (p=0.209), and FD-300 (p=0.914). The FAZ area decreased non-significantly in Group 1 compared to Group 2 (p=0.529). Conclusion: PV appears to be associated with considerable retinal microvascular morphological changes, indicating a potential hyperviscosity impact on retinal VDs that would necessitate careful consideration during PV patient evaluation.