Decreased Macular Choriocapillaris Perfusion in Eyes With Macular Reticular Pseudodrusen Imaged With Swept-Source OCT Angiography

PURPOSE. To determine if macular reticular pseudodrusen (RPD) were associated with markers of impaired macular choroidal perfusion, we investigated measurements of macular choriocapillaris (CC) flow deficits (FDs), CC thickness, and mean choroidal thick-ness (MCT) in eyes with macular RPD compared with normal eyes and eyes with soft drusen.METHODS. Eyes with intermediate age-related macular degeneration (iAMD) and normal eyes underwent 6 x 6 mm swept-source optical coherence tomography angiography (SS-OCTA) imaging to diagnose macular RPD, occupying over 25% of the fovea-centered 5 mm diameter circle, and measure outer retinal layer (ORL) thickness, CC FDs, CC thick-ness, MCT, and choroidal vascularity index (CVI) using previously published strategies within the same fovea-centered 5 mm circle.RESULTS. Ninety eyes were included; 30 normal eyes, 30 eyes with soft drusen, and 30 eyes with macular RPD. The RPD eyes showed higher macular CC FDs than normal eyes (P < 0.001) and soft drusen eyes (P = 0.019). Macular CC thickness was decreased in RPD eyes compared with normal eyes (P < 0.001) and soft drusen eyes (P = 0.016). Macular MCT in RPD eyes was thinner than normal eyes (P = 0.005) and soft drusen eyes (P < 0.001). No statistically and clinically significant differences were found in the ORL thickness and CVI measurements between RPD eyes and the other two groups (all P > 0.05).CONCLUSIONS. Eyes with macular RPD had decreased macular CC perfusion, decreased CC thickness, and decreased MCT measurements compared with normal and soft drusen eyes, suggesting that RPD may result from impaired choroidal perfusion. Keywords: reticular pseudodrusen (RPD), choriocapillaris (CC), flow deficits (FDs), opti-cal coherence tomography (OCT), swept-source optical coherence tomography angiog-raphy (SS-OCTA)

Automated summary

By examining macular reticular pseudodrusen (RPD) eyes, it was found that they were associated with impaired macular choroidal perfusion. The study showed that RPD eyes had higher macular choriocapillaris flow deficits (FDs), decreased choriocapillaris thickness, and thinner mean choroidal thickness (MCT) compared with normal and soft drusen eyes.