title: AMOUNT OF RESIDUAL SILICONE OIL IN VITREOUS CAVITY IS SIGNIFICANTLY CORRELATED WITH AXIAL LENGTH.
abstract: OBJECTIVE
  To determine the parameters of the eye that are significantly correlated with the amount of residual silicone oil remaining after most of it is removed by vitrectomy.
  
  
  METHODS
  Nineteen eyes of 19 patients who had silicone oil removed were studied. The day after the surgery for silicone oil removal, B-scan ultrasonography was performed, and the residual silicone oil droplets were observed as hyperechoic particles in the ultrasonographic images. The images of the vitreous cavity were binarized, and the ratio of area of hyperechoic particles to the total vitreous area was quantified and named the silicone oil index (SOI). The correlations between SOI and clinical findings were determined.
  
  
  RESULTS
  The SOI was significantly and positively correlated with the axial length (AL) and the preoperative intraocular pressure (AL, R = 0.676, P = 0.002; preoperative intraocular pressure, R = 0.771, P < 0.001). Partial correlation analysis showed that the AL remained significantly correlated with the SOI but the preoperative intraocular pressure was not (AL, R = 0.734, P = 0.001; preoperative intraocular pressure, R = 0.417, P = 0.096). None of the other clinical factors was significantly correlated with the SOI.
  
  
  CONCLUSIONS
  Considering the significant correlation between the amount of residual silicone oil and the AL of the eye, myopic eyes should be carefully scrutinized for residual silicone oil.
authors.affiliation: Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Shiihara
authors.forename: Hiroto
authors.initials: H
authors.lastname: Terasaki
authors.forename: Naoya
authors.initials: N
authors.lastname: Yoshihara
authors.forename: Makoto
authors.initials: M
authors.lastname: Shirasawa
authors.forename: Hiroki
authors.initials: H
authors.lastname: Otsuka
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Yamashita
authors.forename: Keita
authors.initials: K
authors.lastname: Yamakiri
authors.forename: Shozo
authors.initials: S
authors.lastname: Sonoda
authors.forename: Taiji
authors.initials: T
authors.lastname: Sakamoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D058452:Axial Length, Eye / Q000473:pathology*; D003930:Diabetic Retinopathy / Q000601:surgery; D004322:Drainage; D058450:Endotamponade; D005129:Eye Foreign Bodies / Q000000981:diagnostic imaging*; D005131:Eye Injuries / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012163:Retinal Detachment / Q000601:surgery; D012189:Retrospective Studies; D012307:Risk Factors; D012827:Silicone Oils; D014463:Ultrasonography; D014821:Vitrectomy; D014822:Vitreous Body / Q000000981:diagnostic imaging*
chemical_list: D012827:Silicone Oils