title: Comparison of tips in coaxial microincision cataract surgery with the bevel-down technique.
abstract: OBJECTIVE
  To compare clinical and intraoperative parameters of 3 phaco tip designs in torsional phacoemulsification using the bevel-down technique.
  
  
  METHODS
  Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea.
  
  
  METHODS
  Clinical trials.
  
  
  METHODS
  Consecutive cases were randomly assigned to have coaxial microincision cataract surgery using the mini-flared 30-degree Kelman tip, mini-flared 45-degree Kelman tip, or reverse mini-flared 30-degree Kelman tip. Clinical measurements included preoperative and 2-month postoperative uncorrected distance visual acuity, endothelial cell counts, and anterior segment optical coherence tomography and preoperative and 1-day postoperative central corneal thickness. Intraoperative measurements included cumulative dissipated energy (CDE) and balanced salt solution use. Intraoperative video recording was used to visualize tip movements in the anterior chamber.
  
  
  RESULTS
  The study enrolled 302 eyes of 297 patients. Intraoperatively, there was less CDE use with the 45-degree Kelman tip and reverse 30-degree Kelman tip than with the 30-degree Kelman tip (P<.05). There were no statistically significant differences in any clinical parameter between the 3 tips. Intraoperative films showed that the opening of the reverse 30-degree Kelman tip approached the nucleus more easily than the opening of the other 2 tips.
  
  
  CONCLUSIONS
  In torsional phacoemulsification through microincisions with the bevel-down technique, the reverse mini-flared 0.9 mm 30-degree Kelman tip was as effective as the mini-flared 0.9 mm 45-degree Kelman tip with regard to intraoperative characteristics, such as total energy use.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors: Department of Ophthalmology and Visual Science, Seoul St Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea.
authors: Eun Kyoung
authors: EK
authors: Kim
authors: Kyong Jin
authors: KJ
authors: Jo
authors: Choun-Ki
authors: CK
authors: Joo
mesh_terms: D000328:Adult; D000368:Aged; D002452:Cell Count; D004728:Endothelium, Corneal / Q000473:pathology; D004867:Equipment Design; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D019654:Lens Implantation, Intraocular; D008297:Male; D008866:Microsurgery / Q000295:instrumentation* / Q000379:methods; D008875:Middle Aged; D018918:Phacoemulsification / Q000295:instrumentation* / Q000379:methods; D011183:Postoperative Complications; D011446:Prospective Studies; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology