June 2015
Volume 56, Issue 7
ARVO Annual Meeting Abstract  |   June 2015
Amount of residual silicone oil in vitreous cavity is significantly correlated with axial length
Author Affiliations & Notes
  • Hideki Shiihara
    Kagoshima university, Kagoshima, Japan
    Tarumizu central hospital, Tarumizu, Japan
  • Hiroto Terasaki
    Kagoshima university, Kagoshima, Japan
  • Naoya Yoshihara
    Kagoshima university, Kagoshima, Japan
  • Hiroki Otsuka
    Kagoshima university, Kagoshima, Japan
  • Toshifumi Yamashita
    Kagoshima university, Kagoshima, Japan
  • Keita Yamakiri
    Kagoshima university, Kagoshima, Japan
  • Shozo Sonoda
    Kagoshima university, Kagoshima, Japan
  • Taiji Sakamoto
    Kagoshima university, Kagoshima, Japan
  • Footnotes
    Commercial Relationships Hideki Shiihara, None; Hiroto Terasaki, None; Naoya Yoshihara, None; Hiroki Otsuka, None; Toshifumi Yamashita, None; Keita Yamakiri, None; Shozo Sonoda, None; Taiji Sakamoto, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 614. doi:
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      Hideki Shiihara, Hiroto Terasaki, Naoya Yoshihara, Hiroki Otsuka, Toshifumi Yamashita, Keita Yamakiri, Shozo Sonoda, Taiji Sakamoto; Amount of residual silicone oil in vitreous cavity is significantly correlated with axial length. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):614.

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      © ARVO (1962-2015); The Authors (2016-present)

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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.


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 hyper-echoic particles in the ultrasonographic images. The images of the vitreous cavity were binarized, and the ratio of area of hyper-echoic particles to the total vitreous area was quantified and named the silicone oil index (SOI). The correlations between SOI and clinical findings were determined.<br />


The SOI was significantly and positively correlated with the axial length (AL) and the preoperative intraocular pressure (IOP) (AL, R=0.676, P=0.002;preoperative IOP, R=0.771, P<0.001). Partial correlation analysis showed that the AL remained significantly correlated with the SOI but the preoperative IOP was not (AL, R=0.734, P=0.001; preoperative IOP, R=0.417, P=0.096). None of the other clinical factors was significantly correlated with the SOI.<br />


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.<br />


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