title: Comparison of spectral-domain and high-penetration OCT for observing morphologic changes in age-related macular degeneration and polypoidal choroidal vasculopathy.
abstract: BACKGROUND
  We compared the visibility of retinal and choroidal pathologies using high-penetration optical coherence tomography (HP-OCT) with a long-wavelength light source (1,050 nm) and conventional spectral-domain OCT (SD-OCT) in age-related macular degeneration (AMD).
  
  
  METHODS
  One hundred and forty-six eyes were included: 63 eyes with AMD, 79 eyes with polypoidal choroidal vasculopathy (PCV), and four eyes with retinal angiomatous proliferation. The SD-OCT and HP-OCT images were compared using the grading criteria to grade the visibility of the retinal changes, the line corresponding to the retinal pigment epithelium (RPE), and the chorioscleral interface (CSI). In 132 eyes with a pigment epithelial detachment (PED), we graded the structures inside the PED, Bruch's line, and the CSI. We compared the visibility of those changes in eyes with subretinal hyperreflective changes due to a subretinal hemorrhage (SRH) (n = 17) or a hemorrhage inside the PED (HPED) (n = 12).
  
  
  RESULTS
  HP-OCT provided superior visibility of the following structures compared to SD-OCT (P < 0.01): the CSI, structures inside the PED, Bruch's line inside the PED, the CSI inside the PED, SRH, type 1 CNV, polyps, and HPED. There were no significant differences between the two OCT devices in the scores for the RPE line, retinal morphology, or type 2 CNV and/or fibrin.
  
  
  CONCLUSIONS
  HP-OCT visualizes morphologies beneath the RPE better than SD-OCT, and is equivalent to SD-OCT for visualizing morphologies above the RPE.
authors.affiliation: Department of Ophthalmology, Osaka University Medical School, Osaka, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Sayanagi
authors.forename: Fumi
authors.initials: F
authors.lastname: Gomi
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ikuno
authors.forename: Masahiro
authors.initials: M
authors.lastname: Akiba
authors.forename: Kohji
authors.initials: K
authors.lastname: Nishida
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D020533:Angiogenesis Inhibitors / Q000627:therapeutic use; D002829:Choroid / Q000473:pathology*; D020256:Choroidal Neovascularization / Q000175:diagnosis*; D004396:Coloring Agents; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D007208:Indocyanine Green; D008268:Macular Degeneration / Q000175:diagnosis* / Q000188:drug therapy; D008297:Male; D008875:Middle Aged; D010778:Photochemotherapy; D011127:Polyps / Q000175:diagnosis*; D012160:Retina / Q000473:pathology*; D041623:Tomography, Optical Coherence / Q000379:methods*
chemical_list: D020533:Angiogenesis Inhibitors; D004396:Coloring Agents; D007208:Indocyanine Green