title: Limitation of Scheimpflug videophotography system in quantifying posterior capsule opacification after intraocular lens implantation.
abstract: OBJECTIVE
  To assess the applicability of Scheimpflug videophotography system for the quantitative comparison of posterior capsule opacification after intraocular lens (IOL) implantation of different materials.
  
  
  METHODS
  Retrospective, nonrandomized, interventional case series.
  
  
  METHODS
  Three groups (n = 15 eyes, each) underwent cataract surgery with implantation of acrylic, silicone, or hydrogel IOL. One year after surgery, the scatter light density at the anterior IOL surface level was measured using EAS-1000. Another three groups (n = 32 eyes, each) received acrylic, silicone, or hydrogel lens. One week after surgery, the scatter light density at the posterior capsule was measured.
  
  
  RESULTS
  Scatter light density at the anterior IOL surface 1 year after implantation was 7.5 +/- 3.0 computer-compatible tape (CCT) steps in the acrylic group, 6.0 +/- 2.3 CCT steps in the silicone group, and 5.0 +/- 3.2 CCT steps in the hydrogel group; the density in the acrylic group was significantly greater than that in the hydrogel group (P =.026). Scatter light density at the posterior capsule level 1 week after surgery was 28.3 +/- 8.9 CCT steps in the acrylic group, 22.2 +/- 2.0 CCT steps in the silicone group, and 26.7 +/- 6.7 CCT steps in the hydrogel group; there was a significant difference between the acrylic and silicone groups (P =.0005) and between the silicone and hydrogel groups (P =.008).
  
  
  CONCLUSIONS
  The IOL material significantly influences the scatter light density measurements of Scheimpflug videophotography system, and thus the intensity of posterior capsule opacification quantified by this system cannot be directly compared with different optic materials.
authors.affiliation: Department of Ophthalmology, Diabetes Center, Tokyo Women's Medical University, Tokyo, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kato
authors.forename: Kazunori
authors.initials: K
authors.lastname: Miyata
authors.forename: Masato
authors.initials: M
authors.lastname: Honbo
authors.forename: Ryohei
authors.initials: R
authors.lastname: Nejima
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Kitano
authors.forename: Shiro
authors.initials: S
authors.lastname: Amano
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Oshika
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D002386:Cataract / Q000175:diagnosis* / Q000209:etiology; D003720:Densitometry; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D010781:Photography / Q000379:methods; D011183:Postoperative Complications; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012826:Silicone Elastomers; D014741:Video Recording
chemical_list: D000180:Acrylic Resins; D012826:Silicone Elastomers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate