Clinical effect of peripheral capsule preservation in eyes with silicone oil tamponade

Table 1 Primary ocular diseases of participating patients

	WCP (n = 31)	CA (n = 17)	PCP (n = 25)
PDR	19	4	6
Rhegmatogenous RD (PVR C)	8	2	8
Giant retinal detachment	2	1	2
Recurrent RD	1	2	2
RD of high myopia	1	0	3
Ocular trauma	0	5	4
Endophthalmitis	0	3	0

WCP: Whole capsule preserved; CA: Capsule absent; PCP: Peripheral capsule preserved; PDR: Proliferative diabetic retinopathy; RD: Retinal detachment; PVR: Proliferative vitreoretinopathy.

Table 2 Comparison of visual acuity among the three groups (mean ± SD, LogMAR)

Group	Number of eyes	Preoperative	1 mo after stage I	1 mo after stage II
WCP	31	1.04 ± 0.38	1.39 ± 0.52	0.93 ± 0.28
CA	17	1.14 ± 0.53	1.29 ± 0.55	0.94 ± 0.45
PCP	25	1.26 ± 0.58	1.41 ± 0.42	0.99 ± 0.45
F		1.39	0.32	0.16
P value		0.26	0.73	0.85

WCP: Whole capsule preserved; CA: Capsule absent; PCP: Peripheral capsule preserved.

Table 3 Comparison of best-corrected visual acuity among the three groups after intraocular lens implantation

	WCP	CA	PCP	P value
BCVA improved	29 (93.55)	16 (94.12)	24 (96)	0.92
BCVA deteriorated	2 (0.06)	1 (5.88)	1 (4)	-

WCP: Whole capsule preserved; CA: Capsule absent; PCP: Peripheral capsule preserved; BCVA: Best-corrected visual acuity.

Table 4 Comparisons of surgery time of stage I and stage II among the three groups (min)

Group	Stage I		Stage II
	mean ± SD	P value	mean ± SD	P value
WCP	72.74 ± 26.90	0.618	5.58 ± 1.19	0.031a
CA	78.91 ± 16.05		15.38 ± 2.04
PCP	78.16 ± 26.39		5.74 ± 1.32

^aP < 0.05, ANOVA. WCP: Whole capsule preserved; CA: Capsule absent; PCP: Peripheral capsule preserved. Stage I: Standard 23G three-port pars plana vitrectomy combined with cataract extraction and silicone oil tamponade; stage II: Silicone oil extraction and intraocular lens implantation.

Table 5 Comparison of surgery time of stage II between groups

Group	P value	95%CI
WCP vs PCP	0.954	-0.95-0.626
WCP vs CA	< 0.01	-10.68-(-8.92)
PCP vs CA	< 0.01	-10.56-(-8.72)

P < 0.01, ANOVA post hoc test with tamhani test. WCP: Whole capsule preserved; CA: Capsule absent; PCP: Peripheral capsule preserved.