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| Trial | Treatment group 1 | Treatment group 2 | Treatment group 3 | Control |
| Battaglia Parodi 1999 | Early grid laser | Delayed grid laser | ‐ | Sham laser |
| BVOS 1984 | Grid laser | ‐ | ‐ | Observation |
| Parodi 2006 | Subthreshold grid laser | Threshold grid laser | ‐ | ‐ |
| Russo 2009 | Grid laser | Intravitreal bevacizumab | ‐ | ‐ |
| SCORE 2009 | Grid laser | 1 mg intravitreal triamcinolone | 4 mg intravitreal triamcinolone | ‐ |
