title: [Comparative clinical study of visual results between two different types of bifocal intraocular lenses].
abstract: OBJECTIVE
  To compare visual results after cataract surgery in patients who underwent bilateral implantation of two different types of bifocal intraocular lenses: the model 811E (Pharmacia), and the model MF4 (Ioltech).
  
  
  METHODS
  This prospective study comprised 99 patients who underwent phacoemulsification with bifocal IOL implantation. The model 811E was implanted in forty-seven eyes of 47 patients (group I) and the model MF4 in fifty-two eyes of 52 patients (group II). Visual acuity (distance and near), complications, and adverse events were measured. The postoperative follow-up in all patients was of 6 months. Patient satisfaction was also valued using a questionnaire.
  
  
  RESULTS
  There was no significant difference in uncorrected distance visual acuity between both groups, which was respectively 0.63 (S.D.: 0.2) for group I and 0.58 (S.D.: 0.16) for group II (p=0.17). Nonetheless a significant difference was found when measuring corrected distance visual acuity, which was 0.86 (S.D.: 0.1) for group I and 0.77 (S.D.: 0.12) for group II (p=0.01). Mean uncorrected near visual acuity was statistically better in group I: J2.00 (S.D.:1.16) in comparison with J2.48 (S.D.:0.83) for group II (p=0.021). Subjectively, both groups indicated high levels of satisfaction, without significant difference between them, being respectively 78% (group I) and 73.4% (group II).
  
  
  CONCLUSIONS
  Our results reveal a superiority of the bifocal diffractive lens over the refractive bifocal lens for corrected distance visual acuity and distance-corrected near visual acuity. Postoperatory complications and satisfaction degree were similar for both IOL models.
authors.affiliation: Clínica Oftalmológica Rahhal, Valencia, España. an.lleop@comv.es
authors.forename: A
authors.initials: A
authors.lastname: Lleó Pérez
authors.forename: L
authors.initials: L
authors.lastname: Alonso Muñoz
authors.forename: J A
authors.initials: JA
authors.lastname: Sanchís Gimeno
authors.forename: M A
authors.initials: MA
authors.lastname: Marcos Jorge
authors.forename: M S
authors.initials: MS
authors.lastname: Rahhal
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000379:methods*; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification / Q000379:methods; D011183:Postoperative Complications; D011446:Prospective Studies; D011474:Prosthesis Design; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology*