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Gray level of different vitreous substitutes.
| Vitreous substitute | Mean gray level | Standard deviation | Offset from control | p-value (significance < 0.05) |
|---|---|---|---|---|
| Air | 39.82 | 5.7 | − 0.29% | 0.97 |
| SF6 | 20.77 | 4.92 | − 2.6% | 0.77 |
| C3F8 | 20.15 | 0.77 | − 5.52% | 0.56 |
| PFCL | 40.58 | 4.8 | 1.6% | 0.83 |
| Silicone oil | 43.63 | 2.21 | 9.24% | 0.32 |
