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Using continuous intraoperative optical coherence tomography measurements of the aphakic eye for intraocular lens power calculation
  1. Nino Hirnschall1,
  2. Sverker Norrby2,
  3. Maria Weber1,
  4. Sophie Maedel1,
  5. Sahand Amir-Asgari1,
  6. Oliver Findl1,3
  1. 1VIROS—Vienna Institute for Research in Ocular Surgery, A Karl Landsteiner Institute, Hanusch Hospital, Vienna, Austria
  2. 2Landauerlaan 17, Leek, The Netherlands
  3. 3Department of Ophthalmology, Moorfields Eye Hospital NHS Foundation Trust, London, UK
  1. Correspondence to Oliver Findl, VIROS—Vienna Institute for Research in Ocular Surgery, A Karl Landsteiner Institute, Hanusch Hospital, Heinrich-Collin-Strasse 30, Vienna 1140, Austria; oliver{at}


Background/aims To include intraoperative measurements of the anterior lens capsule of the aphakic eye into the intraocular lens power calculation (IPC) process and to compare the refractive outcome with conventional IPC formulae.

Methods In this prospective study, a prototype operating microscope with an integrated continuous optical coherence tomography (OCT) device (Visante attached to OPMI VISU 200, Carl Zeiss Meditec AG, Germany) was used to measure the anterior lens capsule position after implanting a capsular tension ring (CTR). Optical biometry (intraocular lens (IOL) Master 500) and ACMaster measurements (Carl Zeiss Meditec AG, Germany) were performed before surgery. Autorefraction and subjective refraction were performed 3 months after surgery. Conventional IPC formulae were compared with a new intraoperatively measured anterior chamber depth (ACD) (ACDIntraOP) partial least squares regression (PLSR) model for prediction of the postoperative refractive outcome.

Results In total, 70 eyes of 70 patients were included. Mean axial eye length (AL) was 23.3 mm (range: 20.6–29.5 mm). Predictive power of the intraoperative measurements was found to be slightly better compared to conventional IOL power calculations. Refractive error dependency on AL for Holladay I, HofferQ, SRK/T, Haigis and ACDintraOP PLSR was r2=−0.42 (p<0.0001), r2=−0.5 (p<0.0001), r2=−0.34 (p=0.010), r2=−0.28 (p=0.049) and r2<0.001 (p=0.866), respectively,

Conclusions ACDIntraOP measurements help to better predict the refractive outcome and could be useful, if implemented in fourth-generation IPC formulae.

  • Intraocular pressure
  • Lens and zonules
  • Optics and Refraction
  • Treatment Surgery

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