title: Histopathologic retinal changes with intravitreous fluorosilicone oil in rabbit eyes.
abstract: BACKGROUND
  Fluorosilicone oil (FSiO, 1,000-10,000 centistokes), which has a higher density (1.29 g/cm3) than vitreous gel, is useful as an operative tool and a tamponade for the inferior retina during difficult retinal detachment surgery. The occurrence of histopathologic retinal changes after injection of FSiO into the vitreous cavity is controversial.
  
  
  METHODS
  Retinas obtained from 18 rabbits were evaluated histopathologically within 8 weeks of injection into the vitreous cavity of purified FSiO or balanced salt solution as control in phakic eyes. The histopathologic retinal changes caused by FSiO were compared with those of previously reported high-density hydrophobic vitreous substitutes, such as silicone-fluorosilicone copolymer oil (SiFO) and perfluorocarbon liquids.
  
  
  RESULTS
  By light and electron microscopy, all retinas injected with FSiO were the same as control retinas within 2 weeks of the injection, but the outer plexiform layer disappeared from the inferior retina 4 weeks after injection. The receptor cell nuclei migrated to the photoreceptor layer in the inferior retina 8 weeks after injection. However, no preretinal membrane, including foam cells, was found in any eye injected with FSiO.
  
  
  CONCLUSIONS
  FSiO may be useful as a temporary vitreous substitute in difficult inferior retinal detachments.
authors.affiliation: Department of Ophthalmology, Mie University School of Medicine, Tsu, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Doi
authors.forename: M
authors.initials: M
authors.lastname: Ning
authors.forename: H
authors.initials: H
authors.lastname: Ida
authors.forename: Y
authors.initials: Y
authors.lastname: Uji
authors.forename: M F
authors.initials: MF
authors.lastname: Refojo
mesh_terms: D000818:Animals; D005260:Female; D007267:Injections; D008297:Male; D011817:Rabbits; D012160:Retina / Q000187:drug effects* / Q000648:ultrastructure; D012164:Retinal Diseases / Q000139:chemically induced* / Q000473:pathology; D012449:Safety; D012827:Silicone Oils / Q000633:toxicity*; D014822:Vitreous Body
chemical_list: D012827:Silicone Oils; C054077:fluorosilicone oil