title: Evaluation of a zonal-progressive multifocal intraocular lens.
abstract: OBJECTIVE
  To determine the clinical usefulness of a five-zone refractive multifocal intraocular lens.
  
  
  METHODS
  After more than 1 year of follow-up, we evaluated the visual function of 22 patients (36 eyes) who had received the MPC-25NB intraocular lens for distance and near visual acuity, kinetic visual acuity, and near contrast sensitivity, and for patient satisfaction.
  
  
  RESULTS
  Of 31 study eyes with less than 1.5 diopters of preoperative keratometric astigmatism, 28 (90.3%) achieved an uncorrected distance visual acuity of 20/40 or better; best-corrected distance visual acuity was 20/20 or better in 31 (86.1%) of 36 eyes. Near visual acuity with distance correction was 20/40 or better in 20 (60.6%) of 33 eyes. Kinetic visual acuity in these patients was comparable to that in patients with monofocal intraocular lenses. Distance visual acuity and near contrast sensitivity were below normal or within the low normal range. There was no significant difference in contrast visual acuity measured by variable contrast visual acuity charts between MPC-25NB and monofocal intraocular lens-implanted eyes (P > .05). Four (22.2%) of 18 patients did not require spectacles when the intraocular lens was implanted for emmetropia. Despite some complaints about near or night vision, all patients expressed satisfaction.
  
  
  CONCLUSIONS
  The MPC-25NB lens provides a level of distance vision comparable to that of a monofocal intraocular lens and a useful level of near visual acuity without spectacles. However, we should carefully evaluate the indication for use of MPC-25NB in patients who require good near vision or night vision.
authors.affiliation: Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan. fwic7788@mb.infoweb.or.jp
authors.forename: K
authors.initials: K
authors.lastname: Negishi
authors.forename: H
authors.initials: H
authors.lastname: Bissen-Miyajima
authors.forename: K
authors.initials: K
authors.lastname: Kato
authors.forename: D
authors.initials: D
authors.lastname: Kurosaka
authors.forename: T
authors.initials: T
authors.lastname: Nagamoto
mesh_terms: D000328:Adult; D000368:Aged; D015350:Contrast Sensitivity / Q000502:physiology*; D005069:Evaluation Studies as Topic; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D018918:Phacoemulsification; D019904:Polymethyl Methacrylate; D014787:Vision Tests; D014792:Visual Acuity / Q000502:physiology*
chemical_list: D019904:Polymethyl Methacrylate