title: Surface and Orbscan II slit-scanning elevation topography in circumscribed posterior keratoconus.
abstract: We used an Orbscan II topography system (Bausch & Lomb) to study anterior and posterior surface abnormalities, keratometry, and topographic pachymetry in a patient with circumscribed posterior keratoconus. This system clearly showed a marked localized paracentral annular elevation in the posterior corneal surface that corresponded to an abrupt decrease in thickness and a slightly localized anterior surface bulge in the anterior float.
authors.affiliation: Centro Oftalmológico Daniel E. Charles, Buenos Aires, Argentina. ncharles@topmail.com.ar
authors.forename: Nicolás
authors.initials: N
authors.lastname: Charles
authors.forename: Martin
authors.initials: M
authors.lastname: Charles
authors.forename: J Oscar
authors.initials: JO
authors.lastname: Croxatto
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Charles
authors.forename: Diego
authors.initials: D
authors.lastname: Wertheimer
mesh_terms: D019781:Corneal Topography / Q000379:methods*; D004108:Dilatation, Pathologic; D004728:Endothelium, Corneal / Q000473:pathology*; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged