Clinical Observation of Macular Vessel Density in Type 2 Diabetics with High Myopia

Abstract

Introduction: To compare the macular retinal vessel density(VD) of diabetics with high myopia, diabetics without high myopia and healthy controls. Methods: This cross-sectional study recruited type 2 diabetic (T2D) people with no history of ocular treatment in our hospital. Thirty T2D people with high myopia (30 eyes) were included in group A, while 30 T2D people (30 eyes) without myopia were included in group B. Another healthy volunteers (30 eyes) were included in group C. The superficial and deep capillary plexuses VD of macular were measured in all subjects by optical coherence tomography angiography (OCTA). In T2D people with high myopia, the correlation between VD in macular regions and baseline data was investigated. Results: ① Overall comparison of the 3 groups: No statistically significant differences in macular central superficial vessel density (SVD) were found in the three groups（P > 0.05). There were significant differences in the temporal, superior, nasal, inferior SVD between the 3 groups (P < 0.05). There were significant differences in macular central, temporal, superior, nasal, and inferior deep vessel density (DVD) between the three groups (P < 0.05). ② Comparison of B (no myopia, T2D group) and C (healthy control group): Inferior SVD in group B was lower than that in group C (P < 0.05). Temporal, superior, nasal, and inferior DVD in group B were lower than those in group C (P < 0.05). ③ A (high myopia group, T2D) compared with B (no myopia, T2D group), A group compared with C (healthy control group): Temporal, superior, nasal, inferior SVD and DVD in group A were all lower than those in group B and C (P < 0.05), DVD in group B were lower than those in group C (P < 0.05). ④ The mean SVD and DVD were not correlated with age, IOP , anterior chamber depth, corneal curvature but they were negatively correlated with axial length and duration of diabetes in the T2D people with high myopia. Conclusion: Myopia and diabetes are two important factors affecting macular retinal vessel density. Comparing with the eyes of T2D people without high myopia, the VD in macular regions shows a higher decline in the eyes of T2D people with high myopia.