Post vitrectomy alterations of retinal microcirculation in complicated diabetic retinopathy with and without silicone oil

Table 2 Retinal parameters and visual acuity in the silicone oil and Air groups

Parameter	Region	Group	Group × time	1 month			3 months
		P value	P value	SO	Air	P value	SO	Air	P value
RT (μm)	Foveal	0.408	0.946	262.5 ± 25.4	265.9 ± 28.0	0.733	256.7 ± 24.5	260.5 ± 25.3	0.426
	Parafoveal	0.013	0.778	382.9 ± 48.4	357.4 ± 25.9	0.016	380.4 ± 45.7	355.6 ± 26.4	0.043
	Perifoveal	0.011	0.821	388.6 ± 46.3	360.5 ± 26.1	0.036	381.4 ± 44.6	354.5 ± 25.8	0.042
VD in the SCP (%)	Foveal	0.712	0.636	31.1 ± 2.9	30.8 ± 1.4	0.936	31.7 ± 2.2	31.9 ± 0.9	0.914
	Parafoveal	0.087	0.255	44.6 ± 4.9	42.8 ± 1.6	0.114	45.3 ± 1.9	44.5 ± 2.9	0.828
	Perifoveal	0.428	0.146	43.5 ± 3.2	42.7 ± 2.3	0.735	45.1 ± 5.2	46.3 ± 4.3	0.869
VD in the DCP (%)	Foveal	0.105	0.293	35.8 ± 2.7	34.3 ± 1.5	0.143	35.5 ± 2.4	35.1 ± 3.9	0.656
	Parafoveal	0.048	0.023	41.7 ± 3.2	43.2 ± 1.9	0.264	40.8 ± 2.3	46.5 ± 3.7	0.026
	Perifoveal	0.774	0.014	42.4 ± 7.5	42.8 ± 2.0	0.933	41.2 ± 6.1	45.4 ± 3.1	0.039
FAZ (mm2)		< 0.001	0.031	0.42 ± 0.14	0.35 ± 0.05	0.025	0.57 ± 0.07	0.38 ± 0.10	< 0.001
BCVA (logMAR)		< 0.001	0.538	0.82 ± 0.33	0.56 ± 0.32	0.022	0.71 ± 0.34	0.45 ± 0.26	0.005

BCVA: Best-corrected visual acuity; DCP: Deep capillary plexus; FAZ: Foveal avascular zone; RT: Retinal thickness; SCP: Superficial capillary plexus; SO: Silicone oil; VD: Vascular density.