title: Comparison of bimanual and micro-coaxial phacoemulsification with torsional ultrasound.
abstract: OBJECTIVE
  To evaluate the efficacy and postoperative outcomes of bimanual and micro-coaxial phacoemulsification with torsional ultrasound.
  
  
  METHODS
  In this prospective randomized series, eyes with age-related cataract were randomly divided into bimanual phacoemulsification and micro-coaxial phacoemulsification groups. Data included preoperative and postoperative corrected distance visual acuity (CDVA), central/temporal corneal thickness, endothelial cell density and intraoperative ultrasound time, cumulative dissipated energy and balanced salt solution volume.
  
  
  RESULTS
  The study evaluated 89 patients (89 eyes). When compared between micro-coaxial and bimanual phaco groups, ultrasound time (57 ± 24 second versus 85 ± 40 second, p < 0.01), cumulative dissipated energy (10 ± 7 versus 14 ± 7, p = 0.01) and balanced salt solution volume (55 ± 19 ml l versus 75 ± 20 ml, p < 0.01) were significantly lower in micro-coaxial phaco group. At 1 day, there were no statistically significant differences in CDVA (p = 0.68) or central corneal thickness (p = 0.48) between two groups; temporal corneal thickness was statistically significantly thicker in bimanual phaco group (1247 ± 123 μm) than that in micro-coaxial phaco group (1108 ± 131 μm, p = 0.01). There were no statistically significant differences in CDVA, central/temporal corneal thickness, or endothelial cell density between two groups 30 days postoperatively (all p values >0.05).
  
  
  CONCLUSIONS
  With rapid visual rehabilitation and comparable endothelial cell loss, both bimanual and micro-coaxial phacoemulsification procedures with torsional ultrasound are efficient for moderate nuclear cataract extraction.
authors.affiliation: State Key laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.
authors.forename: Yujuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yuanling
authors.initials: Y
authors.lastname: Xia
authors.forename: Xialin
authors.initials: X
authors.lastname: Liu
authors.forename: Danying
authors.initials: D
authors.lastname: Zheng
authors.forename: Lixia
authors.initials: L
authors.lastname: Luo
authors.forename: Yizhi
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000085:Acetates / Q000008:administration & dosage; D000368:Aged; D002452:Cell Count; D004338:Drug Combinations; D004728:Endothelium, Corneal / Q000473:pathology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008866:Microsurgery / Q000379:methods*; D008875:Middle Aged; D008903:Minerals / Q000008:administration & dosage; D018918:Phacoemulsification / Q000295:instrumentation / Q000379:methods*; D011446:Prospective Studies; D012965:Sodium Chloride / Q000008:administration & dosage; D013997:Time Factors; D041623:Tomography, Optical Coherence; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology
chemical_list: D000085:Acetates; C030660:BSS solution; D004338:Drug Combinations; D008903:Minerals; D012965:Sodium Chloride