Optical coherence tomography angiography–guided vs indocyanine green angiography–guided half-dose photodynamic therapy for acute central serous chorioretinopathy: 6-month randomized trial results

Purpose This study aimed to compare the anatomic and functional results of optical coherence tomography angiography (OCTA)-guided half-dose photodynamic therapy (PDT) versus indocyanine green angiography (ICGA)-guided PDT in eyes with acute central serous chorioretinopathy (CSC). Methods One hundred and thirty-one eyes of 131 patients with acute central serous chorioretinopathy (CSC) were recruited, and randomly assigned to the OCTA-guided group and ICGA-guided group. The primary outcome measures were the rates of complete subretinal fluid (SRF) resolution at 1 month, 3 months, and 6 months. The secondary outcomes included best-corrected visual acuity (BCVA), central retinal thickness (CRT), choroidal capillary flow deficit density at each scheduled visit, and recurrence rate of SRF at 3 months and 6 months. Results There were 110 eyes that finished the follow-up, with 56 eyes in the OCTA-guided group and 54 eyes in the ICGA guided group. OCTA-guided PDT was demonstrated to be noninferior to ICGA-guided PDT for SRF resolution rate at 1 months and 6 months ( P = 0.021 and P = 0.037), but not at 3 months for acute CSC ( P = 0.247). The average CRT of the ICGA-guided group was significantly lower than that of the OCTA-guided group at 3-month visit ( P = 0.046), but no significant difference was found between them at the 1-month and 6-month visits ( P = 0.891 and 0.527). There was no significant difference between the two groups for BCVA ( P = 0.359, 0.700, and 0.143, respectively) and the deficit area on CC ( P = 0.537, 0.744,and 0.604, respectively) at 1, 3, and 6 months. Conclusion OCTA may replace ICGA to guide PDT for the treatment of acute CSC and their follow-up.