title: Subfoveal choroidal thickness in typical age-related macular degeneration and polypoidal choroidal vasculopathy.
abstract: OBJECTIVE
  To investigate the subfoveal choroidal thickness in eyes with typical age-related macular degeneration (AMD) and polypoidal choroidal vasculopathy (PCV), using enhanced depth imaging optical coherence tomography.
  
  
  METHODS
  Retrospective observational case series of 44 eyes of 44 patients (12 females and 32 males) with typical AMD or PCV located in the subfoveal region. Cross-sectional images of the choroid of each of the involved eyes were obtained by a spectral-domain OCT. The choroidal thickness under the fovea was retrospectively studied.
  
  
  RESULTS
  Of the 44 eyes involved in this study, 21 eyes were diagnosed as typical AMD and the other 23 eyes were diagnosed as PCV. The difference in subfoveal choroidal thickness between the eyes with typical AMD (245 μm) and those with PCV (293 μm) was statistically significant, even after adjusting for age, spherical equivalent, and gender distribution (P = 0.045). When compared to eyes with subfoveal choroidal thickness less than 300 μm, those with subfoveal choroidal thickness of 300 μm or more were 5.6 times more likely to have PCV (adjusted odds ratio 5.60, 95% confidence interval 1.30-24.0, P = 0.021).
  
  
  CONCLUSIONS
  The choroid under the fovea was thicker in eyes with PCV than those with typical AMD. This result suggests that the choroidal vascular lesion seen in PCV may not be just the choroidal neovascularization accompanied by saccular capillary dilations at the border, but may have a significant structural difference in the choroid compared to typical AMD.
authors.affiliation: Department of Ophthalmology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyo-ku, Kyoto 602-0841, Japan. hidekoiz@koto.kpu-m.ac.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Koizumi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yamagishi
authors.forename: Taizo
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Ryo
authors.initials: R
authors.lastname: Kawasaki
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kinoshita
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002829:Choroid / Q000098:blood supply / Q000473:pathology*; D015862:Choroid Diseases / Q000175:diagnosis*; D005260:Female; D005451:Fluorescein Angiography; D005584:Fovea Centralis; D006801:Humans; D008268:Macular Degeneration / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D016491:Peripheral Vascular Diseases / Q000175:diagnosis*; D012189:Retrospective Studies; D041623:Tomography, Optical Coherence