title: Two-year follow-up after implantation of diffractive aspheric silicone multifocal intraocular lenses.
abstract: OBJECTIVE
  To evaluate the stability of visual performance after implantation of a diffractive aspheric silicone multifocal intraocular lens (MIOL).
  
  
  METHODS
  Thirty eyes of 15 patients received the Tecnis MIOL ZM900 (Abbot Medical Optics) after cataract extraction at Tokyo Dental College Suidobashi Hospital. The uncorrected and best-corrected distance visual acuities (UCDVA, BCDVA); uncorrected, distance-corrected and best-corrected near VAs (UCNVA, DCNVA and BCNVA); spherical equivalent refraction, spectacle independence, contrast sensitivity and posterior capsule opacification (PCO) were measured at 1 week; 1, 3 and 6 months; and 1 and 2 years postoperatively.
  
  
  RESULTS
  Two years postoperatively, the UCDVA was 0.01 logMAR, BCDVA -0.09 logMAR, UCNVA 0.19 logMAR, DCNVA 0.1 logMAR and BCNVA 0.04 logMAR. There was no significant change from 1 week through 2 years. The percent of spherical equivalent refraction error within ± 0.5 diopter was 63.4% at 2 years. No patient required spectacles for reading; two patients have used spectacles for intermediate vision when necessary. One eye underwent Nd:YAG laser posterior capsulotomy because of PCO.
  
  
  CONCLUSIONS
  The visual performance after implantation of the Tecnis MIOL was stable for 2 years. A low rate of PCO contributed to the long-term visual performance.
authors.affiliation: Department of Ophthalmology, Tokyo Dental College Suidobashi Hospital, Tokyo, Japan. mamiyoshino@tdc.ac.jp
authors.forename: Mami
authors.initials: M
authors.lastname: Yoshino
authors.forename: Hiroko
authors.initials: H
authors.lastname: Bissen-Miyajima
authors.forename: Shinichi
authors.initials: S
authors.lastname: Oki
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Minami
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Nakamura
mesh_terms: D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D011474:Prosthesis Design; D019591:Pseudophakia / Q000503:physiopathology*; D012029:Refraction, Ocular / Q000502:physiology; D012826:Silicone Elastomers; D013997:Time Factors; D014792:Visual Acuity / Q000502:physiology*
chemical_list: D012826:Silicone Elastomers