title: Visual function after implantation of a diffractive aspheric trifocal intraocular lens.
abstract: OBJECTIVE
  To evaluate distance, intermediate, and near vision after bilateral implantation of a diffractive aspheric trifocal intraocular lens (IOL).
  
  
  METHODS
  This study enrolled 204 eyes of 102 patients who had bilateral implantation of the AT LISA tri 839MP IOL. Monocular and binocular uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA) (4 meters), monocular and binocular uncorrected near visual acuity (UNVA) and distance-corrected near visual acuity (DCNVA) (30, 40 centimeters), binocular uncorrected intermediate visual acuity (UIVA) and distance-corrected intermediate visual acuity (DCIVA) (50, 60, 70 centimeters), the defocus curve, and binocular photopic and mesopic contrast sensitivity with and without glare were evaluated over 6 months.
  
  
  RESULTS
  No statistically significant differences in visual acuity outcomes between follow-up visits were found at any distance evaluated (p&gt;0.05). Six months postoperatively, the mean monocular UDVA and UNVA were comparable to preoperative CDVA and DCNVA, respectively. All patients achieved a binocular CDVA of 20/25 or better. The mean binocular DCIVA ranged from 0.11 ± 0.11 (70 cm) to 0.07 ± 0.11 logMAR (50 cm). The mean binocular DCNVA was 20/25 or better in nearly 87% of patients. The defocus curve showed a wide range of useful vision, with no statistically significant differences in visual acuity at intermediate distances (p = 0.151). Mesopic contrast sensitivity was lower than under photopic conditions, particularly at medium and high spatial frequencies (p&lt;0.001).
  
  
  CONCLUSIONS
  Bilateral implantation of this trifocal IOL provides good visual outcomes at far, intermediate, and near distances, being an effective solution to reduce spectacle dependence after lensectomy.
authors.affiliation: Fernández-Vega Ophthalmological Institute, Oviedo - Spain.|Surgery Department, School of Medicine, University of Oviedo, Oviedo - Spain.
authors.forename: José F
authors.initials: JF
authors.lastname: Alfonso
authors.affiliation: Fernández-Vega Ophthalmological Institute, Oviedo - Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Vega Cueto
authors.affiliation: GIO, Optics and Optometry and Vision Sciences Department, Faculty of Physics, University of Valencia, Oviedo - Spain.
authors.forename: Lurdes
authors.initials: L
authors.lastname: Belda-Salmerón
authors.affiliation: GIO, Optics and Optometry and Vision Sciences Department, Faculty of Physics, University of Valencia, Oviedo - Spain.
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
authors.affiliation: Fernández-Vega Ophthalmological Institute, Oviedo - Spain.|Surgery Department, School of Medicine, University of Oviedo, Oviedo - Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Vega
mesh_terms: D000328:Adult; D000368:Aged; D055253:Color Vision / Q000502:physiology; D015350:Contrast Sensitivity / Q000502:physiology; D005260:Female; D019466:Glare; 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; D015348:Vision, Binocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology*