Incidence and Timing of Pigment Epithelial Detachment and Subretinal Fluid Development in Type 3 Macular Neovascularization associated with Age-related Macular Degeneration

To evaluate the incidence and timing of pigment epithelial detachment (PED) and subretinal fluid(SRF) development in type 3 macular neovascularization (MNV).This retrospective study included 84 patients who were diagnosed with treatment-naïve type 3 MNV who did not show SRF at diagnosis. All patients were initially treated with three loading injections of ranibizumab or aflibercept. Following the initial loading injections, as-needed regimen was performed for retreatment. The development of either PED or SRF was identified. The incidence and timing of PED development in patients without PED at diagnosis and that of SRF development in patients with PED at diagnosis were evaluated.The mean follow-up period was 41.3±20.7 months after diagnosis. Among the 32 patients without serous PED at diagnosis, PED developed in 20 (62.5%) at a mean of 10.9±5.1 months after diagnosis. PED development was noted within 12 months in 15 patients (46.8%; 75.0% among the PED development cases). In 52 patients with serous PED and without SRF at diagnosis, 15 developed SRF (28.8%) at a mean of 11.2±6.4 months after diagnosis. SRF development was noted within 12 months in 9 patients (17.3%; 66.6% among the SRF development cases).PED and SRF developed in a substantial proportion of patients with type 3 MNV. The average period of development of these pathologic findings was within 12 months of diagnosis, suggesting the need for active treatment during the early treatment period to improve treatment outcomes.