title: Straylight measurements in pseudophakic eyes with natural and dilated pupils: one-year follow-up.
abstract: OBJECTIVE
  To compare the amount of straylight in natural pupils and dilated pupils in pseudophakic eyes 6 weeks and 1 year after cataract extraction.
  
  
  METHODS
  Laboratory of Experimental Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
  
  
  METHODS
  This study evaluated patients with bilateral age-related cataract who had cataract surgery with implantation of an aspheric Tecnis ZA9003 or spherical Sensar AR40e intraocular lens (IOL). Straylight measurements were performed with a C-Quant straylight meter 6 weeks after surgery (with natural pupils) and 1 year after surgery (with natural and dilated pupils) in a randomly chosen eye. Retroillumination photographs of dilated pupils were taken to document posterior capsule opacification. The main outcome variable for straylight measurements was the logarithmic straylight parameter, log(s).
  
  
  RESULTS
  Twenty-two patients were evaluated. There was a statistically significant decrease in straylight in a natural pupil between 6 weeks (mean 1.44 log[s]) and 1 year (mean 1.30 log[s]) postoperatively (P = .012). The straylight parameter was greater after dilation (mean 1.48 log[s]) than with a natural pupil (1.29 log[s]) at 1 year (P = .012). This difference was greater when more anterior capsule was visible in the pupillary area (P = .031).
  
  
  CONCLUSIONS
  Straylight decreased significantly in the first year after cataract surgery. Furthermore, it increased with increasing pupil size, which was associated with a capsulorhexis smaller than the pupil. This indicates the capsulorhexis should be as large as possible to prevent straylight, especially under low-luminance conditions when the pupil is large.
authors.affiliation: Laboratory of Experimental Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. k.van.gaalen@ohk.umcg.nl
authors.forename: Kim W
authors.initials: KW
authors.lastname: van Gaalen
authors.forename: Steven A
authors.initials: SA
authors.lastname: Koopmans
authors.forename: Johanna M M
authors.initials: JM
authors.lastname: Hooymans
authors.forename: Nomdo M
authors.initials: NM
authors.lastname: Jansonius
authors.forename: Aart C
authors.initials: AC
authors.lastname: Kooijman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D004338:Drug Combinations; D005260:Female; D005500:Follow-Up Studies; D019466:Glare; D006801:Humans; D019654:Lens Implantation, Intraocular; D008027:Light; D008297:Male; D008875:Middle Aged; D009184:Mydriatics / Q000008:administration & dosage; D018918:Phacoemulsification; D010656:Phenylephrine / Q000008:administration & dosage; D019591:Pseudophakia / Q000503:physiopathology*; D011680:Pupil / Q000187:drug effects / Q000528:radiation effects*; D012542:Scattering, Radiation; D014331:Tropicamide / Q000008:administration & dosage
chemical_list: D004338:Drug Combinations; D009184:Mydriatics; D010656:Phenylephrine; D014331:Tropicamide