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Reticular pseudodrusen: current understanding.

Antony J Wightman1,2,3, Robyn H Guymer1,2,3

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Reticular pseudodrusen (RPD) are distinct retinal deposits linked to age-related macular degeneration (AMD). Their unique composition and association with rod photoreceptor dysfunction suggest specific disease pathways.

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Area of Science:

  • Ophthalmology
  • Retinal Diseases
  • Macular Degeneration

Background:

  • Reticular pseudodrusen (RPD), or subretinal drusenoid deposits, are located above the retinal pigment epithelium.
  • RPD are associated with age-related macular degeneration (AMD) and other retinal dystrophies.
  • RPD are more prevalent in females and older individuals, often appearing bilaterally.

Purpose of the Study:

  • To review the clinical significance, imaging features, and pathogenesis of reticular pseudodrusen.
  • To differentiate RPD from other drusen subtypes based on location and composition.
  • To explore the role of rod photoreceptor dysfunction in RPD development.

Main Methods:

  • Review of multimodal imaging techniques including color fundus photography, spectral domain optical coherence tomography, fundus auto-fluorescence, and near-infrared reflectance.
  • Histological examination of RPD compared to typical drusen.
  • Analysis of genetic risk factors associated with AMD and RPD.

Main Results:

  • RPD exhibit characteristic net-like patterns on imaging and distinct histological compositions compared to typical drusen.
  • Genetic variants increasing AMD risk also increase RPD risk.
  • Opsin presence and association with rod photoreceptor areas suggest rod dysfunction in RPD pathogenesis.

Conclusions:

  • RPD are a distinct entity with unique pathological features and imaging characteristics.
  • RPD are strongly linked to AMD and may indicate increased risk for advanced disease.
  • Rod photoreceptor dysfunction is implicated in the pathogenesis of reticular pseudodrusen.