A case series was used to evaluate the efficacy of half-fluence photodynamic therapy (PDT) for chronic central serous chorioretinopathy (CSCR). Patients were treated with standard-dose verteporfin and half-fluence PDT. Totally 13 eyes from 11 patients were included. The mean patient age was 52.0y. There was a mean reduction in central retinal thickness of 107.0 microns. Totally 7/13 eyes (53.8%) achieved resolution of subretinal fluid (SRF) on optical coherence tomography (OCT) scan after 1 treatment with PDT. Four eyes had further treatment with PDT; of these 1 eye achieved resolution of SRF. Seven of the 13 eyes (53.8%) achieved an improvement of more than 5 ETDRS letters. One patient experienced acute macula oedema 1d post PDT treatment. These results support the hypothesis that half-fluence PDT can have a positive effect in chronic CSCR for a gain in visual acuity and reduction in sub-retinal fluid. Acute macula oedema is a rare but potential adverse effect of half-fluence PDT.