Clinical study on quantitative analysis of optic disc parameters in patients with non-proliferative diabetic retinopathy by global OCTA
Objective To quantitatively analyze the optic disc parameters of patients with non proliferative diabetes retinopathy(NPDR)using global optical coherence tomography angiography(OCTA).Methods This study collected the clinical data of DM patients admitted to our hospital from September 2022 to Septem-ber 2023 and divided the patients into NPDR group and no diabetic retinopathy(NDR)group.At the same time,healthy individuals were selected to form the healthy group.All subjects underwent global OCTA ima-ging to assess optic disc parameters,including the thickness of peripapillary retinal nerve fiber layer(pRNFL)and peripapillary capillaries vessel density(ppVD)of the optic disc.Correlation analyasis between pRNFL and ppVD in DM patients was conducted.Results The cup-to-disc ratio and vertical area ratio were higher in the NDR and NPDR groups compared to the healthy group(P<0.05),with the NPDR group exhibiting a higher horizontal area ratio(P<0.05).The average,lower half side,and lower side pRNFL thickness were lower in the NDR group compared to the healthy group(P<0.05).The average pRNFL thickness and the pRNFL thinckness in the lower half side,lower side,ST quadrant,SN quadrant,and IN quadrant in the NPDR group were lower than those in the healthy group(P<0.05).Similarly,The NDR group had lower ppVD in the up-per half side,lower half side,and TU quadrant than the healthy group(P<0.05).The NPDR group also had lower ppVD in the average,upper half side,lower half side,upper side,TU quadrant,ST quadrant,IT quad-rant,and TL quadrant than the healthy group(P<0.05).Correlation analysis revealed a positive correlation between pRNFL thickness and ppVD in DM patients.Conclusion Optic disc damage can occur in the early stages of diabetes mellitus,progressing to microvascular and neuropathic changes.The thickness of pRNFL is closely associated with ppVD.