title: Interlenticular opacification: dual-optic versus piggyback intraocular lenses.
abstract: OBJECTIVE
  To evaluate and compare the incidence of capsular bag opacification, particularly interlenticular opacification (ILO), in rabbit eyes implanted with a dual-optic silicone intraocular lens (IOL) or piggyback lenses.
  
  
  METHODS
  John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
  
  
  METHODS
  Ten dual-optic study IOLs (Synchrony), 10 control pairs of piggyback silicone-plate lenses, and 10 control pairs of piggyback single-piece hydrophobic acrylic lenses were implanted in the capsular bag of 30 rabbit eyes following phacoemulsification. After a 6-week follow-up, the rabbits were killed and their eyes enucleated. Anterior capsule opacification and posterior capsule opacification were graded on a 0 to 4 scale from a posterior or Miyake-Apple view. Interlenticular opacification was noted in relation to the center of the interlenticular space (periphery, paracentral, and central area) and to the number of quadrants involved. The eyes were then evaluated histopathologically.
  
  
  RESULTS
  Postoperative inflammatory reaction was similar in all groups. Interlenticular opacification formation was statistically different among the 3 groups of lenses (ILO extension, P = .0013, and ILO extension x ILO quadrants, P = .0023; Kruskal-Wallis test). Pairwise post comparisons of ILO formation showed that the differences between the study IOL group and the silicone-plate lens group were not significant. Interlenticular opacification post comparisons between the hydrophobic acrylic lenses and the study lens or the silicone-plate lenses were significant (P = .002 and P = .001, respectively). Histopathologic examination showed extension of the proliferating cortical material from the peripheral Soemmering's ring into the interlenticular space, causing ILO, especially with the pairs of hydrophobic acrylic lenses.
  
  
  CONCLUSIONS
  In this rabbit model, ILO was significantly associated with pairs of hydrophobic acrylic lenses implanted in the bag. This study appears to confirm clinical observations that implantation of 2 silicone-plate lenses in the bag is not associated with ILO. There was also a relative lack of ILO with the dual-optic silicone lens.
authors.affiliation: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah 84132, USA. liliana.werner@hsc.utah.edu
authors.forename: Liliana
authors.initials: L
authors.lastname: Werner
authors.forename: Nick
authors.initials: N
authors.lastname: Mamalis
authors.forename: Scott
authors.initials: S
authors.lastname: Stevens
authors.forename: Brian
authors.initials: B
authors.lastname: Hunter
authors.forename: Jesse J L
authors.initials: JJ
authors.lastname: Chew
authors.forename: Luis G
authors.initials: LG
authors.lastname: Vargas
mesh_terms: D000818:Animals; D002386:Cataract / Q000209:etiology*; D015994:Incidence; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D019654:Lens Implantation, Intraocular / Q000379:methods*; D007910:Lenses, Intraocular; D011183:Postoperative Complications; D011817:Rabbits; D012826:Silicone Elastomers
chemical_list: D012826:Silicone Elastomers