“…For chromovitrectomy, the white steroid may be injected intraoperatively to aid in the observation of the transparent vitreous gel as well as for ILM-peeling in macular hole surgery [2,3]. However, during chromovitrectomy some amount of TA may penetrate through the macular hole, thereby migrating into the subretinal space [22,23]. For retinal drug delivery, subretinal TA-infusion may provide high choroidal drug concentrations for the therapy of angiogenic and edematous chorioretinal diseases [11].…”