title: Accuracy and reproducibility of axial length measurement in eyes with silicone oil endotamponade.
abstract: OBJECTIVE
  To assess the accuracy and signal quality of axial length measurements by partial coherence laser interferometry (PCI) for optical biometry in eyes with conventional silicone oil (SO) or heavy silicone oil (HSO) as endotamponade.
  
  
  METHODS
  We included 26 eyes with SO endotamponade (SO, n = 15; HSO, n = 11) using a Zeiss IOLMaster for measurement of axial length the day before and at least 6 weeks after SO removal. We analysed the intra-individual deviation between both measurements and signal-to-noise ratio (SNR) as a marker for signal quality. We included 16 contralateral eyes without history of vitreoretinal surgery to act as the control group.
  
  
  RESULTS
  The mean axial length was 24.76 (SD 2.07) mm (SO 24.63 (SD 2.12) mm, HSO 24.93 (SD 2.10) mm, control 24.95 (SD 2.61) mm) before and 24.75 (SD 1.96) mm after oil removal with a mean intra-individual deviation of 0.13 (SD 0.11) mm (SO 0.13 (SD 0.12) mm, HSO 0.13 (SD 0.09) mm, control 0.02 (SD 0.01) mm) while SNR at baseline was 5.7 (SD 3.5) (SO 6.6 (SD 4.0), HSO 4.4 (SD 2.2), control 8.6 (SD 3.9)).
  
  
  CONCLUSIONS
  In our analysis, optical biometry using PCI generated results with acceptable accuracy and signal quality for measurement of axial length in SO-filled eyes.
authors.affiliation: Department of Ophthalmology, RWTH Technical University, D-52057 Aachen, Germany. groessler@ukaachen.de
authors.forename: G F
authors.initials: GF
authors.lastname: Roessler
authors.forename: J K
authors.initials: JK
authors.lastname: Huth
authors.forename: T S
authors.initials: TS
authors.lastname: Dietlein
authors.forename: S
authors.initials: S
authors.lastname: Dinslage
authors.forename: N
authors.initials: N
authors.lastname: Plange
authors.forename: P
authors.initials: P
authors.lastname: Walter
authors.forename: B A E
authors.initials: BA
authors.lastname: Mazinani
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001035:Aphakia / Q000503:physiopathology; D001699:Biometry; D005260:Female; D006801:Humans; D007368:Interferometry / Q000379:methods / Q000592:standards; D007908:Lens, Crystalline / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009883:Ophthalmic Solutions; D019591:Pseudophakia / Q000503:physiopathology; D015203:Reproducibility of Results; D012164:Retinal Diseases / Q000503:physiopathology / Q000601:surgery; D012680:Sensitivity and Specificity; D012827:Silicone Oils / Q000627:therapeutic use; D041623:Tomography, Optical Coherence / Q000379:methods* / Q000592:standards
chemical_list: D009883:Ophthalmic Solutions; D012827:Silicone Oils; C539718:densiron-68