title: Correlation of higher order aberrations in the anterior corneal surface and degree of keratoconus measured with a Scheimpflug camera.
abstract: OBJECTIVE
  To determine the correlation of higher order aberrations in anterior corneal surface and degree of keratoconus measured with a Scheimpflug camera.
  
  
  METHODS
  A descriptive, cross-sectional study was conducted on 152 eyes (both eyes of each patient) of patients with keratoconus, from January 2009 to April 2014. An examination was performed on the corneal aberrometry in the anterior corneal surface, and topographic mapping (by Amsler and Muckenhirn classification) was used to determine the degree of keratoconus. The correlation between high-order aberrations in anterior corneal surface and the degree of keratoconus was determined.
  
  
  RESULTS
  Coma aberration significantly correlated with keratoconus severity (r=.60, P<.01), as well as with the high order aberration (r=.61, P<.01). Trefoil and keratoconus were weakly correlated (r=.34, P<.01).
  
  
  CONCLUSIONS
  Higher order aberrations in anterior corneal surface were positively correlated with the degree of keratoconus in a similar way to the entire optical system.
authors.affiliation: Departamento de Córnea, Asociación para Evitar la Ceguera en México D.F, Coyoacán, México. Electronic address: saraimd88@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Delgado
authors.affiliation: Departamento de Córnea, Asociación para Evitar la Ceguera en México D.F, Coyoacán, México.
authors.forename: J
authors.initials: J
authors.lastname: Velazco
authors.affiliation: Departamento de Córnea, Centro Cardio-Neuro-Oftlamológico y Trasplante, Santo Domingo, República Dominicana.
authors.forename: R M
authors.initials: RM
authors.lastname: Delgado Pelayo
authors.affiliation: Departamento de Córnea, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, D.F, México.
authors.forename: N
authors.initials: N
authors.lastname: Ruiz-Quintero
mesh_terms: D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography / Q000295:instrumentation / Q000379:methods*; D057108:Corneal Wavefront Aberration / Q000000981:diagnostic imaging*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000473:pathology*; D008297:Male; D010781:Photography / Q000295:instrumentation / Q000379:methods*; D012720:Severity of Illness Index
keywords: Aberraciones de alto orden; Coma; High order aberrations; Keratoconus; Queratocono; Scheimpflug; Trefoil