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

Table 3 Retinal parameters and visual acuity before and after silicone oil removal

Parameter	Region	Status	Status × time	1 month			3 months
		P value	P value	SO	SOR	P value	SO	SOR	P value
RT (μm)	Foveal	0.720	0.911	261.9 ± 22.1	264.8 ± 32.2	0.721	254.1 ± 21.2	255.7 ± 25.3	0.841
	Parafoveal	0.448	0.952	388.8 ± 44.3	380.7 ± 25.5	0.450	387.1 ± 45.6	378.1 ± 25.1	0.401
	Perifoveal	0.206	0.404	397.0 ± 48.7	380.0 ± 34.3	0.210	376.2 ± 49.6	375.1 ± 30.7	0.933
VD in the SCP (%)	Foveal	0.484	0.718	31.0 ± 2.6	31.6 ± 2.3	0.486	31.8 ± 2.0	33.0 ± 4.6	0.230
	Parafoveal	0.664	0.734	45.0 ± 5.4	44.5 ± 4.1	0.665	45.1 ± 2.2	44.1 ± 1.6	0.363
	Perifoveal	0.458	0.498	43.5 ± 3.2	44.3 ± 3.2	0.460	45.3 ± 5.0	45.0 ± 2.1	0.830
VD in the DCP (%)	Foveal	0.714	0.667	35.2 ± 2.0	34.9 ± 4.3	0.715	35.7 ± 1.8	35.9 ± 3.1	0.810
	Parafoveal	0.991	0.029	41.2 ± 3.3	41.2 ± 5.2	0.991	40.6 ± 1.9	44.1 ± 3.1	0.003
	Perifoveal	0.243	0.020	42.7 ± 8.4	40.8 ± 2.7	0.247	40.5 ± 3.3	43.9 ± 3.7	0.037
FAZ (mm2)		0.001	0.050	0.43 ± 0.13	0.54 ± 0.15	0.002	0.56 ± 0.09	0.58 ± 0.07	0.636
BCVA (logMAR)		0.158	0.856	0.85 ± 0.32	0.73 ± 0.30	0.162	0.74 ± 0.31	0.55 ± 0.22	0.041

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