The Assessment of the Degree of Silicone Oil Emulsification by Yong Un Shin, Heeyoon Cho, Mincheol Seong, Min Ho Kang, Eun Hee Hong, South Korea



The purpose of this study is to assess the degree of silicone oil (SO) emulsification using wide fundus photography and optical density ratio (ODR) in swept-source optical coherence tomography (SS-OCT).


This retrospective study included patients undergoing intravitreal silicone oil tamponade after vitrectomy. After surgery, ultra-wide fundus photography and SS-OCT were performed monthly. According to the degree of emulsified droplets in ultra-wide fundus photography, emulsification was graded from 0 to 4+ qualitatively. The ODRs were calculated by dividing the optical density value in optic cup into the optical density of silicone oil near retinal surface. We analyzed the change in the grade based on ultra-wide fundus photography and ODRS over time.


51 eyes of 51 patients who underwent SO tamponade were included. The mean time from SO tamponade to SO removal was 4.88 months. The most common cause of SO tamponade was rhegmatogenous retinal detachment (51%). The longer the duration of SO tamponade was, the more the grade of emulsification in wide FP and ODR increased, which were statistically significant (P<0.05). There was a statistically significant correlation between the grade of emulsification in wide FP and ODR, which was more prominent in cases with the severe grade of emulsification.


Our study suggest that ultra-wide fundus photography and OCT can be used to determine the degree of emulsification objectively, which may be useful in when to remove silicon oil before SO-associated complications occur.



Yong Un Shin, Heeyoon Cho, Mincheol Seong, Min Ho Kang, Eun Hee Hong
Hanyang University College of Medicine
South Korea
Email :
Cell Phone: +821086662213
Work Phone: +82315602168