title: Refractive shift of silicone oil tamponade in pseudophakic eye.
abstract: BACKGROUND
  Refraction change of silicone oil (SO) tamponade in phakic and aphakic eye has been studied thoroughly; however, it is rarely studied in pseudophakic eye. In this paper we aimed to deduce a theoretical formula predicting refractive shift of silicone oil tamponade in pseudophakic eye and compared it with clinical findings.
  
  
  METHODS
  A theoretical formula was deduced through strict geometric optical principles under the Helmholtz Schematic eye model. Pre/postoperative refractive status of patients who previously underwent phacoemulsification, intraocular lens (IOL) implant, vitrectomy, SO tamponade and required SO extraction was studied.
  
  
  RESULTS
  Twenty-six patients (27 eyes, 13 males and 13 females) were studied. Refractive error of SO-off was -1.88 ± 2.73D, and of SO-in was 2.02 ± 3.90. Refractive shift of SO tamponade was -3.90 ± 1.74D. Refractive shift was significantly associated with refractive power of IOL (r = -0.7903, p < 0.0001, Pearson correlation test) and anterior chamber distance (ACD, r = 0.3840, p = 0.0480, Pearson correlation test). Theoretical refractive shift was -4.10 ± 1.51D, and there was no significant difference between the theoretical and the clinical refractive shift (p = 0.3329, Paired T test).
  
  
  CONCLUSIONS
  Refractive shift of SO tamponade in pseudophakic eye correlates with refractive power of implanted IOL and ACD, and strong correlation between theoretical formula and clinical findings was detected.
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China.
authors.forename: Jiuke
authors.initials: J
authors.lastname: Li
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Jin
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhai
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China.
authors.forename: Yuanmin
authors.initials: Y
authors.lastname: Dai
authors.affiliation: Ophthalmology Department of SIR RUN RUN SHAW hospital, SIR RUN RUN SHAW Institute of Clinical Medicine of Zhejiang University, #3 Qingchun East Road, Hangzhou, Zhejiang, 310016, People's Republic of China. liyumin77@hotmail.com.
authors.forename: Yumin
authors.initials: Y
authors.lastname: Li
mesh_terms: D058450:Endotamponade; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008962:Models, Theoretical; D018918:Phacoemulsification; D019591:Pseudophakia / Q000503:physiopathology* / Q000601:surgery; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000503:physiopathology*; D012827:Silicone Oils; D014792:Visual Acuity; D014821:Vitrectomy
chemical_list: D012827:Silicone Oils
keywords: Artificial lens; Refractive shift; Silicone oil tamponade; Theoretical formula