title: Corneal impact of ultrasound and bevel position in phacoemulsification.
abstract: OBJECTIVE
  To investigate the amplitude of ultrasound waves that reach the cornea with the phacoemulsification tip at different angles.
  
  
  METHODS
  Institute for Applied Mechanics and Control Engineering, University of Siegen, Siegen, Germany.
  
  
  METHODS
  A model eye was constructed with an ultrasound tip (angle 45 degrees) in the typical position during the procedure and a sensor mounted in the apex of the artificial cornea. The sensor measured the incoming ultrasound waves. Thirty bursts of ultrasound energy were set at 100% power with the bevel of the tip facing up toward the cornea, and 30 bursts were set with the bevel facing down toward the lens.
  
  
  RESULTS
  There was no statistically significant difference in the measurements with the tips bevel up and bevel down.
  
  
  CONCLUSIONS
  There was no significant difference in the corneal load from ultrasound waves with the phacoemulsification tip in a bevel-up or bevel-down position.
authors.affiliation: University Eye Hospital Tuebingen, Siegen, Germany. andreas.frohn@t-online.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Frohn
authors.forename: Hans Burkhard
authors.initials: HB
authors.lastname: Dick
authors.forename: Claus Peter
authors.initials: CP
authors.lastname: Fritzen
mesh_terms: D003315:Cornea / Q000528:radiation effects*; D006801:Humans; D008954:Models, Biological; D018918:Phacoemulsification / Q000379:methods*; D014464:Ultrasonic Therapy