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Accuracy of a new partial coherence interferometry analyzer for biometric measurements
  1. Mike P Holzer (mike.holzer{at}med.uni-heidelberg.de),
  2. Mladen Mamusa,
  3. Gerd U Auffarth (gerd.auffarth{at}med.uni-heidelberg.de)
  1. University of Heidelberg, Dept. of Ophthalmology, International Vision Correction Research Centre, Germany
  2. University of Heidelberg, Dept. of Ophthalmology, International Vision Correction Research Centre, Germany
  3. University of Heidelberg, Dept. of Ophthalmology, International Vision Correction Research Centre, Germany

    Abstract

    Background/aims: Precise biometry is an essential preoperative parameter for refractive as well as cataract surgery. A new device based on partial coherence interferometry technology was tested and evaluated in regards to accuracy of measurements.

    Methods: In a prospective clinical study 200 eyes of 100 healthy phakic volunteers were measured with a functional prototype of the new ALLEGRO BioGraph (Wavelight AG) / LENSTAR LS 900 (Haag Streit AG) biometer and the IOLMaster V.5 (Carl Zeiss Meditec AG). Repeated measurements as recommended by the manufacturers were performed with both devices and compared using Spearman Correlation calculations (WinSTAT).

    Results: Spearman Correlation revealed a high correlation for axial length and keratometry measurements between the two devices tested. Anterior chamber depth, however, had a lower correlation between the two biometry devices. Also the mean values of the anterior chamber depth differed (IOLMaster 3.48 ± 0.42 mm versus BioGraph/LENSTAR 3.64 ± 0.26 mm, respectively), however this was not statistically different (p>0.05, t-test).

    Conclusion: The new biometer provided results that correlated very well to those of the IOL Master. The ALLEGRO BioGraph / LENSTAR LS 900 is a precise new device that contains additional features which are a helpful tool for any cataract or refractive surgeon.

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