Visual acuity
There were 7 studies reporting VA11,22,30,31,33-35, and the VA of primary IOL group was similar to that of primary aphakia group [MD=-0.12, 95%CI: (-0.19, -0.05), p=0.91]. There was no heterogeneity (I2 =0%)(Figure 4). No publication bias was found (Table 2).