title: Changes of corneal aberrations in sitting and supine positions.
abstract: OBJECTIVE
  To examine the effect of posture change on corneal aberrations and corneal curvature.
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  The Keratron topographer, improved to measure patients in the supine position, was used to measure the corneal aberrations and the curvature in nine healthy volunteers. The first measurement took place with the subject in the sitting position and the others in the supine position, immediately after assuming the supine position and then 30 minutes later.
  
  
  RESULTS
  The total higher-order and spherical-like aberrations were significantly increased from the sitting position to the supine position (P=.011, and P=.044, Scheffé test).
  
  
  CONCLUSIONS
  These results suggest that the increase in the higher-order aberration from the sitting to the supine position acts to limit the improvements in visual performance after customized refractive surgery based on wavefront measurement.
authors.affiliation: Department of Ophthalmology and Visual Science, Kitasato University Graduate School of Medical Sciences, Sagamihara, Japan. dm05011c@st.kitasato-u.ac.jp
authors.forename: Takushi
authors.initials: T
authors.lastname: Kawamorita
authors.forename: Tomoya
authors.initials: T
authors.lastname: Handa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uozato
mesh_terms: D000328:Adult; D003315:Cornea / Q000502:physiology*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D011187:Posture; D012030:Refractive Errors / Q000503:physiopathology*; D014792:Visual Acuity / Q000502:physiology