Purpose To investigate the intraretinal structural and vascular alterations in patients featuring reticular pseudodrusen (RPD), RPD with outer retinal atrophy (ORA), and drusen.
Design Observational cross-sectional study.
Methods Clinical practice study including 68 eyes of 57 patients (22 eyes of 17 patients with RPD; 24 eyes of 21 patients with RPD+ORA; 22 eyes of 19 patients with drusen). Each patient underwent spectral-domain optical coherence tomography (OCT) and OCT angiography (OCT-A). Measurement of retinal layers’ thickness was obtained by the automated segmentation protocol of the Spectralis OCT (Heidelberg Eye Explorer V.220.127.116.11). The superficial capillary plexus (SCP) and the deep capillary plexus (DCP) vessel density, as well as the size of the foveal avascular zone were calculated on 3×3 OCT-A. Main outcome was to compare vessel density at the SCP and DCP among the groups and controls.
Results At the SCP, the vessel density was lower in RPD and RPD+ORA patients with respect to controls (P=0.02 and P=0.003, respectively). At the DCP, meaningful disparity was found between the study groups and the healthy subjects in the vessel density (P<0.001, P=0.04 and P=0.001 for RPD, RDP+ORA and drusen, respectively). The ganglion cell layer (GCL) was thinner in all patients affected either by RPD, RPD+ORA or drusen compared with healthy subjects (P=0.02, P=0.03 and P=0.004, respectively).
Conclusion Significant retinal vascular loss is a common feature of patients with non-exudative age-related macular degeneration, more pronounced in those featuring RPD and RPD+ORA. It is associated with retinal thinning, localised particularly at the GCL, compared with controls.
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Contributors All the authors contributed to the conception or design of the work; the acquisition, analysis and interpretation of data; drafting the work; revising it critically for important intellectual content and gave final approval of the version to be published.
Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Obtained.
Ethics approval San Raffaele Hospital Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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