Prevalence of reticular pseudodrusen in age-related macular degeneration with newly diagnosed choroidal neovascularisation.

AIM

To investigate the prevalence of reticular pseudodrusen (RPD) in eyes of patients presenting with newly diagnosed choroidal neovascularisation (CNV) in age-related macular degeneration (AMD), and to analyse the association between RPD, age-related maculopathy (ARM) and AMD.

METHOD

Two observational consecutive prospective series. In series 1, patients with AMD with newly diagnosed CNV were sampled to determine the incidence of RPD. Eyes with and without RPD were compared by the Mann-Whitney non-parametric test and Fisher's exact test for age, sex of patients, the eye involved and type of CNV. Series 2 comprised 100 patients referred for fundus photography, fluorescein and/or indocyanine green angiography, for whom pictures showed RPD. This second cohort was then selected from a larger group of patients.

RESULTS

Patients with newly diagnosed CNV in series 1 comprised 67 women and 33 men, aged 57-96 years (mean 79.5). CNV was "classic" (32 eyes), "occult" (41) or exhibited vascularised pigment epithelial detachment (PED, 11), retinal angiomatous proliferation (RAP) with or without PED (13), or haemorrhagic or fibrovascular scarring (3). In all, 24 (24%) eyes had RPD. The prevalence of RAP was significantly higher in eyes with RPD than in those without (p = 0.0128), despite the small number of patients with RAP. In series 2, 100 patients with RPD were enrolled in 3 months, and corresponded to 8% of the overall cases referred to our centre (Centre Ophtalmologique d'Imagerie et de Laser, Paris, France). There were 77 women and 23 men, aged 54-93 years (mean 79.2). Eyes with RPD (n = 155) usually exhibited signs of ARM or AMD, including soft drusen (101 eyes) and/or retinal pigment epithelium abnormalities (70), geographical atrophy (27) and/or CNV (61). In both studies, examination of blue-light fundus pictures was extremely helpful in diagnosing RPD.

CONCLUSION

RPD have a high prevalence among patients with AMD with newly diagnosed CNV (24% of cases). RPD were commonly associated with ARM or AMD. This study suggests that eyes with RPD could be classified as a phenotype of ARM.