title: Photoreceptor layer thinning over drusen in eyes with age-related macular degeneration imaged in vivo with spectral-domain optical coherence tomography.
abstract: OBJECTIVE
  Detect changes in the neurosensory retina using spectral-domain optical coherence tomography (SD OCT) imaging over drusen in age-related macular degeneration (AMD). Quantitative imaging biomarkers may aid in defining risk of disease progression.
  
  
  METHODS
  Cross-sectional, case-control study evaluating SD OCT testing in AMD.
  
  
  METHODS
  Seventeen eyes of 12 subjects with nonneovascular AMD and drusen and 17 eyes of 10 age-matched control subjects.
  
  
  METHODS
  Spectral-domain OCT imaging across the fovea in the study eye with multiple 10- to 12-mm scans of 1000 A scans each.
  
  
  METHODS
  In summed SD OCT scans, the height of individual retinal layers either over drusen or at corresponding locations in the control eye and qualitative changes in retinal layers over drusen. Secondary measures included photoreceptor layer (PRL) area, inner retinal area, and retinal pigment epithelium (RPE)/drusen area.
  
  
  RESULTS
  The PRL was thinned over 97% of drusen, average PRL thickness was reduced by 27.5% over drusen compared with over a similar location in controls, and the finding of a difference was valid and significant (P=0.004). Photoreceptor outer segments were absent over at least 1 druse in 47% of eyes. Despite thinning of the PRL, inner retinal thickness remained unchanged. We observed 2 types of hyperreflective abnormalities in the neurosensory retina over drusen. Distinct hyperreflective speckled patterns occurred over drusen in 41% of AMD eyes and never in control eyes. A prominent hyperreflective haze was present in the photoreceptor nuclear layer over drusen in 67% of AMD eyes and more subtly in the photoreceptor nuclear layer in 18% of control eyes (no drusen).
  
  
  CONCLUSIONS
  With SD OCT as used in this study, we can easily detect and measure changes in PRL over drusen. Decreased PRL thickness over drusen suggests a degenerative process, with cell loss leading to decreased visual function. The hyperreflective foci overlying drusen are likely to represent progression of disease RPE cell migration into the retina and possible photoreceptor degeneration or glial scar formation. A longitudinal study using SD OCT to examine and measure the neurosensory retina over drusen will resolve the timeline of degenerative changes relative to druse formation.
authors.affiliation: Duke University Medical Center, Department of Ophthalmology, Durham, North Carolina 27710, USA.
authors.forename: Stefanie G
authors.initials: SG
authors.lastname: Schuman
authors.forename: Anjum F
authors.initials: AF
authors.lastname: Koreishi
authors.forename: Sina
authors.initials: S
authors.lastname: Farsiu
authors.forename: Sin-ho
authors.initials: SH
authors.lastname: Jung
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Izatt
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Toth
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D008268:Macular Degeneration / Q000175:diagnosis*; D008297:Male; D020419:Photoreceptor Cells, Vertebrate / Q000473:pathology*; D015593:Retinal Drusen / Q000175:diagnosis*; D041623:Tomography, Optical Coherence