title: Postoperative refractive error after phacovitrectomy for epiretinal membrane with and without macular oedema.
abstract: OBJECTIVE
  This study was initiated to investigate whether the presence of macular oedema influenced intraocular lens (IOL) power calculation in eyes with epiretinal membrane.
  
  
  METHODS
  The files of patients undergoing combined phacoemulsification were retrospectively reviewed. Two groups were defined according to presence of macular oedema. The main outcome measure was the IOL power prediction error (PE). Secondary outcome measures were the correlation between preoperative macular thickness, absolute change of macular thickness and dioptric shift. The mean postoperative PE achieved with the Haigis formula was compared with the PE that would have been obtained had the SRKII and HofferQ formulas been used.
  
  
  RESULTS
  We investigated 47 eyes of 47 consecutive patients. Regardless of the IOL formula used, the PE was on average higher in eyes without macula oedema (group 1). The myopic dioptric shift was dependent on preoperative macular thickness and absolute change of macular thickness. This association was more markedly pronounced in group 1.
  
  
  CONCLUSIONS
  Increased retinal thickness is the main cause for underestimation of the cornea-photoreceptor layer distance, and therefore could contribute to inaccuracy in IOL power calculations. The current results show that a myopic shift tends to be less pronounced in cases where a macula oedema is present. Eyes with pure traction have less predictable refractive results in terms of higher PE and dioptric shift.
authors: Department of Ophthalmology, University Medical Center Hamburg-Eppendorf (UKE), Martinistraße 52, 20246, Hamburg, Germany, andi.frings@gmail.com.
authors: Andreas
authors: A
authors: Frings
authors: Simon
authors: S
authors: Dulz
authors: Christos
authors: C
authors: Skevas
authors: Birthe
authors: B
authors: Stemplewitz
authors: Stephan J
authors: SJ
authors: Linke
authors: Gisbert
authors: G
authors: Richard
authors: Lars
authors: L
authors: Wagenfeld
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019773:Epiretinal Membrane / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008269:Macular Edema / Q000150:complications* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D018918:Phacoemulsification; D011183:Postoperative Complications; D012030:Refractive Errors / Q000209:etiology* / Q000503:physiopathology; D012160:Retina / Q000473:pathology; D012189:Retrospective Studies; D014821:Vitrectomy
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