title: Scanning electron microscopic characteristics of small-incision intraocular lenses.
abstract: OBJECTIVE
  To evaluate the surface characteristics of commonly used, small-incision, intraocular lenses (IOLs).
  
  
  METHODS
  Representative samples of five groups of foldable IOLs (4 silicone and 1 acrylic) underwent surface and edge-finish examination using a slit lamp. The IOLs were folded using a folding block and forceps. All the IOLs then were examined using a scanning electron microscope. A one-piece polymethylmethacrylate IOL was used for comparing surface-finish characteristics. The IOLs were examined for optic surface quality, edge finish, haptic, haptic/optic junction, and possible post-folding modifications.
  
  
  RESULTS
  Slit-lamp evaluation of the surface quality of all of the silicone lenses demonstrated a smooth finish of the optic surface, edge, and haptics. Scanning electron microscopic analysis of the IOLs demonstrated adequately finished haptics or footplates and optics. Excess molding flash was seen on the edges of the some of the silicone IOLs, and no molding flash was observed on others. The acrylic IOL had a somewhat sharper optic edge. Irregular finish of the haptic/optic junctions of some of the IOLs (both silicone and acrylic) was noted.
  
  
  CONCLUSIONS
  Currently available foldable IOLs have demonstrated adequate lens finish. However, irregularities of the haptic/optic junctions and molding flash are present on most IOLs evaluated, indicating room for improvement in the finish of foldable IOLs. Phacoemulsification with capsular bag IOL placement may decrease the clinical significance of these relatively subtle lens finish irregularities.
authors.affiliation: John A. Moran Eye Center, University of Utah, Salt Lake City 84132, USA.
authors.forename: O
authors.initials: O
authors.lastname: Omar
authors.forename: N
authors.initials: N
authors.lastname: Mamalis
authors.forename: J
authors.initials: J
authors.lastname: Veiga
authors.forename: M
authors.initials: M
authors.lastname: Tamura
authors.forename: R J
authors.initials: RJ
authors.lastname: Olson
mesh_terms: D020106:Acrylamide; D000178:Acrylamides; D001672:Biocompatible Materials; D006801:Humans; D007910:Lenses, Intraocular; D020366:Methylmethacrylate; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D018918:Phacoemulsification; D012826:Silicone Elastomers; D013536:Suture Techniques
chemical_list: D000178:Acrylamides; D001672:Biocompatible Materials; D008768:Methylmethacrylates; D012826:Silicone Elastomers; D020366:Methylmethacrylate; D020106:Acrylamide