Best TCM formula to treat retinal detachment

There is never a “best” anything in Chinese Medicine. The “best” formula is the one that most closely matches your patients underlying causes and conditions - not a general formula that has some usage towards eye and vision issues.

In general retinal detachment will be from weak kidney energy with deficient heat, liver qi stagnation and/or liver blood deficiency, and/or damp-heat issues. Some possible formulas for these patterns might be kidney yin deficiency and/or liver yin deficiency (possibly qi ju di huang wan or ming mu di huang wan), liver qi stagnation with heat (possibly jia wei xiao yao wan), liver blood deficiency, and damp-heat patterns (possibly san ren tang - gallbladder damp heat).