title: Disk halo size measured in individuals with monofocal versus diffractive multifocal intraocular lenses.
abstract: OBJECTIVE
  To compare disk halo size in response to a glare source in eyes with an aspheric apodized diffractive multifocal intraocular lens (IOL) or aspheric monofocal IOL.
  
  
  METHODS
  Rementeria Ophthalmological Clinic, Madrid, Spain.
  
  
  METHODS
  Prospective randomized masked study.
  
  
  METHODS
  Halo radius was measured using a vision monitor (MonCv3) with low-luminance optotypes in eyes that had cataract surgery and bilateral implantion of an Acrysof Restor SN6AD1 multifocal IOL or Acrysof IQ monofocal IOL 6 to 9 months previously. The visual angle subtended by the disk halo radius was calculated in minutes of arc (arcmin). Patient complaints of halo disturbances were recorded. Monocular uncorrected distance visual acutity (UDVA) and corrected distance visual acuity (CDVA) were measured using high-contrast (96%) and low-contrast (10%) logMAR letter charts.
  
  
  RESULTS
  The study comprised 39 eyes of 39 subjects (aged 70 to 80 years); 21 eyes had a multifocal IOL and 18 eyes a monofocal IOL. The mean halo radius was 35 arcmin larger in the multifocal IOL group than the monofocal group (P < .05). Greater halo effects were reported in the multifocal IOL group (P < .05). The mean monocular high-contrast UDVA and low-contrast UDVA did not vary significantly between groups, whereas the mean monocular high-contrast CDVA and low-contrast CDVA were significantly worse at 0.12 logMAR and 0.13 logMAR in the multifocal than in the monofocal IOL group, respectively (P < .01). A significant positive correlation was detected by multiple linear regression between the halo radius and low-contrast UDVA in the multifocal IOL group (r = 0.72, P < .001).
  
  
  CONCLUSIONS
  The diffractive multifocal IOL gave rise to a larger disk halo size, which was correlated with a worse low-contrast UDVA.
  
  
  BACKGROUND
  None of the authors has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Applied Vision Research Group (Puell, Pérez-Carrasco), Faculty of Optics and Optometry, Complutense University of Madrid, and Clínica Rementería (Hurtado-Ceña, Álvarez-Rementería), Madrid, Spain. Electronic address: puellma@ucm.es.
authors.forename: M C
authors.initials: MC
authors.lastname: Puell
authors.affiliation: From the Applied Vision Research Group (Puell, Pérez-Carrasco), Faculty of Optics and Optometry, Complutense University of Madrid, and Clínica Rementería (Hurtado-Ceña, Álvarez-Rementería), Madrid, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Pérez-Carrasco
authors.affiliation: From the Applied Vision Research Group (Puell, Pérez-Carrasco), Faculty of Optics and Optometry, Complutense University of Madrid, and Clínica Rementería (Hurtado-Ceña, Álvarez-Rementería), Madrid, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: Hurtado-Ceña
authors.affiliation: From the Applied Vision Research Group (Puell, Pérez-Carrasco), Faculty of Optics and Optometry, Complutense University of Madrid, and Clínica Rementería (Hurtado-Ceña, Álvarez-Rementería), Madrid, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Álvarez-Rementería
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002387:Cataract Extraction; D004311:Double-Blind Method; D005260:Female; D019466:Glare / Q000009:adverse effects*; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D011446:Prospective Studies; D011474:Prosthesis Design; D011680:Pupil / Q000502:physiology; D014786:Vision Disorders / Q000209:etiology / Q000473:pathology* / Q000503:physiopathology; D014792:Visual Acuity / Q000502:physiology