title: Prospective Comparison of One-Piece and Three-Piece Tecnis Aspheric Intraocular Lenses: 1-year Stability and its Effect on Visual Function.
abstract: OBJECTIVE
  To compare the stability and visual function of one-piece hydrophobic intraocular lens (IOL) (ZCB00, Abbot Medical Optics) and a three-piece hydrophobic IOL (ZA9003, Abbot Medical Optics) after cataract surgery.
  
  
  METHODS
  Eighteen eyes of 18 patients with the one-piece IOL and 20 eyes of 20 patients with the three-piece IOL who underwent cataract surgery were evaluated prospectively on best corrected distance visual acuity, postoperative refractive error, IOL decentration and tilt, anterior chamber depth (ACD), spherical aberration and contrast sensitivity. Measurements were performed 1 week and 1, 3, 6 and 12 months postoperatively. The postoperative outcomes were compared between the two groups.
  
  
  RESULTS
  In the one-piece group, a hyperopic refractive error (p < 0.002) and deeper ACDs during 1-year post-operatively were observed compared with the three-piece group. There were no significant differences in BCVA, IOL tilt, spherical aberration or contrast sensitivity.
  
  
  CONCLUSIONS
  The stability of the one-piece IOL was greater than that of the three-piece IOL. The postoperative ACD and refractive error demonstrated that an anteriorly offset haptic in the one-piece IOL allowed incremental fixation to the posterior capsule.
authors.affiliation: Miyata Eye Hospital , Miyakonojo, Miyazaki , Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Miyata
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Kataoka
authors.forename: Jiro
authors.initials: J
authors.lastname: Matsunaga
authors.forename: Masato
authors.initials: M
authors.lastname: Honbo
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Minami
mesh_terms: D000368:Aged; D000867:Anterior Chamber / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007910:Lenses, Intraocular; D008297:Male; D018918:Phacoemulsification / Q000379:methods; D011184:Postoperative Period; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular / Q000502:physiology*; D013997:Time Factors; D014792:Visual Acuity / Q000502:physiology*
keywords: Anterior chamber depth; IOL stability; lens haptic; one-piece intraocular lens; posterior capsule