Retinal Pigment Epithelium Degeneration Associated With Subretinal Drusenoid Deposits in Age-Related Macular Degeneration.

Academic Article

Abstract

  • PURPOSE: To test whether increased light transmission (hypertransmission) through subretinal drusenoid deposits (SDD) into the choroid in age-related macular degeneration (AMD) represented retinal pigment epithelium (RPE) degeneration. DESIGN: Cross-sectional study. METHODS: Nineteen eyes of 12 patients with early- to intermediate-stage AMD and 18 eyes of 12 normal subjects were evaluated with color fundus photography, optical coherence tomography (OCT), and high-resolution adaptive optics scanning laser ophthalmoscopy (AOSLO) at baseline and 24 months later. SDD were classified using an OCT-based 3-stage grading system. Hypertransmission beneath SDD into the choroid was examined in OCT. SDD microstructure was assessed with AOSLO. To characterize the hypertransmission-associated chorioretinal degeneration, choroidal thickness and photoreceptor length were measured in OCT at 1 mm and 2 mm superior, inferior, temporal, and nasal to the foveal center. RESULTS: OCT disclosed hypertransmission beneath stage 3 SDD in 8 eyes. These lesions showed a distinctive regressing structure in AOSLO, compared with stage 3 lesions without hypertransmission. The phenomenon persisted at follow-up, and new hypertransmission developed as SDD advanced. In eyes with hypertransmission, choroids were thinner than those of normal eyes at all sites (by 44%-56%, P ≤ .0028) and those of eyes with SDD but without hypertransmission at superior and temporal sites (by 31%-46%, P ≤ .039). Photoreceptors were significantly shorter than those in normal eyes (by 6%-26%, P ≤ .0379). CONCLUSIONS: Hypertransmission into the choroid, accompanied with SDD regression and thinning of choroid and photoreceptor layers, indicates RPE degeneration associated with advanced stages in the SDD life cycle.
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    Keywords

  • Aged, Choroid, Cross-Sectional Studies, Female, Fluorescein Angiography, Fundus Oculi, Humans, Macular Degeneration, Male, Ophthalmoscopy, Retinal Drusen, Retinal Pigment Epithelium, Retrospective Studies, Tomography, Optical Coherence
  • Digital Object Identifier (doi)

    Pubmed Id

  • 19185169
  • Author List

  • Xu X; Liu X; Wang X; Clark ME; McGwin G; Owsley C; Curcio CA; Zhang Y
  • Start Page

  • 87
  • End Page

  • 98
  • Volume

  • 175