Table 2.
Clinical Findings Before Primary PPV and SOR as Well as Surgical Approaches
| Clinical Findings | Total (182 Eyes) | Eyes with Good Visual Outcome (102 eyes) | Eyes with Poor Visual Outcome (80 Eyes) | P value |
|---|---|---|---|---|
| Primary PPV with SO tamponade | ||||
| Preop BCVA (ETDRS letter score) Median (Q1, Q3) | −3.90 (−15.0, 2.18) | 0.05 (−15.0, 19.95) | −15 (−15.0, 0.05) | <0.001 |
| Time to primary procedure (months) Median (Q1, Q3) | 2 (1.0, 6.0) | 2 (0.8, 5.0) | 3 (1.0, 6.0) | 0.051 |
| No. of retinal surgery N (%) | 0.001 | |||
| Single | 139 (76.4) | 87 (85.3) | 52 (65) | |
| Multiple | 43 (23.6) | 15 (14.7) | 28 (35) | |
| Superior retinal break location N (%) | 47 (26.4) | 31 (31.3) | 16 (20.3) | 0.098 |
| No. of retinal breaks N (%) | 0.157 | |||
| Not seen | 21 (11.8) | 9 (9.1) | 12 (15.2) | |
| Single | 46 (25.8) | 29 (29.3) | 17 (21.5) | |
| Multiple | 111 (58.6) | 61 (61.6) | 50 (63.3) | |
| Presence of giant tear N (%) | 28 (16.4) | 5 (15.6) | 13 (17.6) | 0.662 |
| Presence of PVR N (%) | 0.091 | |||
| Grade A | 13 (7.1) | 8 (7.8) | 5 (6.2) | |
| Grade B | 19 (10.4) | 9 (8.8) | 10 (12.5) | |
| Grade C | 63 (37.9) | 38 (37.3) | 31 (38.8) | |
| Total retinal detachment N (%) | 62 (34.3) | 34 (33.7) | 28 (35) | 0.851 |
| Macula on status N (%) | 12 (6.7) | 10(10) | 2 (2.5) | 0.047 |
| Combined scleral buckling N (%) | 26 (14.5) | 10(10) | 16 (20.3) | 0.053 |
| Combined cataract surgery N (%) | 50 (27.9) | 23(23) | 27 (34.2) | 0.096 |
| Circumferential peripheral retinopexy N (%) | 60 (34.09) | 28 (28.57) | 32 (41.03) | 0.097 |
| Viscosity of SO N (%) | 0.978 | |||
| 1300 cSt. | 137 (75.3) | 76 (74.5) | 61 (76.2) | |
| 5700 cSt. | 20 (10.9) | 12 (11.8) | 8(10) | |
| Silicone Oil Removal | ||||
| BCVA before SOR (ETDRS letter score) Median (Q1, Q3) | 0.05 (−3.9, 35.0) | 35 (0.05, 46.09) | 0.05 (−15.0, 0.05) | <0.001 |
| Time to removal (months) Median (Q1, Q3) | 9.4 (6.2, 13.5) | 9.1 (5.6, 12.8) | 9.8 (6.3, 14.3) | 0.50 |
| Cataract surgery during SOR N (%) | 53 (29.1) | 36 (35.3) | 17 (21.2) | 0.038 |
| Lens status before SOR N (%) | 0.067 | |||
| Phakic | 76 (41.8) | 48 (47.1) | 28 (35) | |
| Pseudophakic | 88 (48.4) | 48 (47.1) | 40 (50) | |
| Aphakia | 18 (9.9) | 6 (5.9) | 12(15) | |
| Additional Endolaser N (%) | 10 (5.5) | 1(1) | 9 (11.2) | 0.005 |
| Pseudophakia at last follow up | 158 (86.81) | 96 (94.12) | 62 (77.50) | 0.002 |
Abbreviations: BCVA, best-corrected visual acuity; cSt, centistokes; ETDRS, Early Treatment Diabetic Retinopathy Study; PVR, proliferative vitreoretinopathy; SO, silicone oil; SOR, silicone oil removal.