title: Sectorial and annular quantitative area pachymetry with the Orbscan II.
abstract: OBJECTIVE
  To present a new application of quantitative area pachymetry of the cornea.
  
  
  METHODS
  Sectorial quantitative area pachymetry of small corneal zones located at the center and surrounding areas is possible by means of the statistical analysis device and tools menu of Orbscan II (Bausch and Lomb).
  
  
  RESULTS
  Average pachymetry of 1 central zone and 12 small zones around the center may be shown in the pachymetry map by simply formatting the system. Average pachymetry, standard deviation, rate of thickness variation (slope), and volume of analyzed annular corneal zone can also be automatically shown in a data window. The examination results can be printed and kept on record.
  
  
  CONCLUSIONS
  The method is simple and descriptive. This type of preoperative evaluation may guide the manual or laser preparation of channels for intracorneal segments and the corneal trephination for lamellar or penetrating keratoplasty.
authors.affiliation: Dept of Ophthalmology, Paulista School of Medicine, Federal University of São Paulo, Rua Expedicionários 427, Sousas, Campinas, SP 13105-008, Brazil. cgarce@mpc.com.br
authors.forename: Carlos G
authors.initials: CG
authors.lastname: Arce
authors.forename: Jaime
authors.initials: J
authors.lastname: Martiz
authors.forename: Juan B
authors.initials: JB
authors.lastname: Alzamora
authors.forename: Paulo
authors.initials: P
authors.lastname: Schor
authors.forename: Mauro S Q
authors.initials: MS
authors.lastname: Campos
mesh_terms: D003315:Cornea / Q000166:cytology / Q000000981:diagnostic imaging*; D019781:Corneal Topography / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D014463:Ultrasonography