[Retracted] The Efficacy of Glucocorticoids in the Treatment of Nonarteritic Anterior Ischemic Optic Neuropathy: A Systematic Review and Meta-Analysis

Figure 6

Funnel plot showing the publication bias. (a) visual acuity; (b) visual field; (c) retinal nerve fiber layer; and (d) improvement rate of visual acuity.

(a)

(b)

(c)

(d)