Evaluation of GRADE evidence quality
| Outcome indicators | MD, 95%CI | Risk of bias | Inconsistency | Indirectness | Imprecision | Publication bias | Upgrade quality | Quality |
| SCP VD | 0.41 (–1.26 to 2.09) | Serious* | Serious† | No | No | Undetected | None | Low |
| DCP VD | 1.53 (0.62 to 2.44) | Serious* | No | No | No | Undetected | None | Moderate |
| FAZ | 0.01 (–0.01 to 0.03) | Serious* | No | No | No | Undetected | None | Moderate |
| CC VD | 0.76 (–1.11 to 2.64) | Serious* | Serious† | No | No | Undetected | None | Low |
*Absence of allocation concealment and blinding.
†The p value of the heterogeneity test was <0.1 and I2>50%.
CC VD, choriocapillaris vascular density; DCP VD, deep capillary plexus VD; FAZ, foveal avascular zone; GRADE, Grading of Recommendations Assessment, Development and Evaluation; MD, mean difference; SCP VD, superficial capillary plexus VD.