title: Effect of a single-piece aspheric hydrophobic acrylic intraocular lens design on centration and rotation.
abstract: OBJECTIVE
  To assess the rotation and centration stability of the new design features of a 1-piece aspheric hydrophobic acrylic intraocular lens (IOL).
  
  
  METHODS
  National Eye Hospital, Cairo, Egypt.
  
  
  METHODS
  Randomized clinical trial.
  
  
  METHODS
  Patients in this study had implantation of a 1-piece Tecnis 1 ZCB00 IOL or a 3-piece Sensar AR40e IOL. Decentration and rotation were recorded immediately postoperatively, and 2 to 3 days and 8 weeks postoperatively. This was done using 2 slitlamp eyepieces and referring to constant corneal landmarks (ie, the limbus and the phaco incision).
  
  
  RESULTS
  Thirty-two 1-piece IOLs and 30 3-piece IOLs were implanted. Although the 1-piece IOLs moved toward the corneal center more than the 3-piece IOLs between 3 days and 8 weeks postoperatively (P=.054), the difference was not statistically significant between 0 day and 3 days or during the entire follow-up (P=.546 and P=.367, respectively). There were no statistically significant differences in the horizontal or vertical components of this movement between the 2 groups (P=.883 and P=.636, respectively). The mean rotation was 2.5 degrees ± 9.1 (SD) in the 1-piece IOL group and 0 ± 6.5 degrees in the 3-piece IOL group, with no statistically significant difference between the groups (P=.521).
  
  
  CONCLUSIONS
  The new 1-piece design showed relatively good centration and stability in the horizontal, vertical, and rotational aspects.
authors: Ophthalmology Department, Ain Shams University and National Eye Hospital, Cairo, Egypt. dr_maged_roshdy@med.asu.edu.eg
authors: Maged M
authors: MM
authors: Roshdy
authors: Riad F
authors: RF
authors: Riad
authors: Fathy F
authors: FF
authors: Morkos
authors: Abdallah K
authors: AK
authors: Hassouna
authors: Sherein S
authors: SS
authors: Wahba
mesh_terms: D000180:Acrylic Resins; D060437:Artificial Lens Implant Migration / Q000503:physiopathology*; D001672:Biocompatible Materials; D005260:Female; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular / Q000502:physiology; D012399:Rotation; D014792:Visual Acuity / Q000502:physiology
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials