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Biometry and refractive outcome of eyes filled with silicone oil by standardized echography and partial coherence interferometry

  • Clinical Investigation
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Abstract

Background

We evaluated the validity of calculations for refractive outcome in cataract surgery in silicone oil-filled eyes. The retrosilicone space (RSS) was included in these calculations.

Methods

In a prospective study the axial length (AL) of silicone oil-filled eyes was measured. with standardized A-scan echography (SAE) and partial coherence interferometry (PCI). Meldrum’s formula was used to transform the velocity of ultrasound within the vitreous cavity. To investigate whether refractive outcome can be calculated accurately, we assessed the difference between precalculated and final refractive outcome. Furthermore, we determined the advantages and disadvantages of SAE and PCI. A minor aim was to assess whether theAL of the two eyes differed significantly.

Results

In 85% of 117 eyes the difference between precalculated and postsurgical refraction was smaller than 1 diopter spherical and statistically not significant (p>0.2). The mean AL was 24.1 mm (range 20.0–31.4 mm). The difference in outcome between the two methods was without statistical significance: the AL difference was 0.4 (±2.6) mm on measurement with SAE and 0.04 (±0.46) mm with PCI. PCI has the advantage that it can be performed more easily, without contact, while echography is advantageous in the presence of advanced cataracts. In supine position an oil-free fluid space behind the silicone oil was detected with echography. The mean dimension of this space was 1.9 (±0.67) mm and it was taken into consideration for IOL calculation. The mean AL difference between the two eyes was 0.4 mm, but the difference was greater than 1 mm in 26% of the patients.

Conclusion

The AL of eyes filled with silicone oil can be measured reliably with SAE and PCI. In supine position the RSS has to be considered to obtain more accurate IOL calculations.

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Acknowledgement

Translations support was done carefully by Mrs. MT Untersmayr.

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Authors and Affiliations

  1. Department of Ophthalmology, Medical University of Vienna, Waehringer Gürtel 18-20, 1090, Vienna, Austria

    Johannes Nepp, Katharina Krepler, Kerstin Jandrasits, Wolfgang Hauff, Georg Hanselmayer, Michaela Velikay-Parel & Andreas Wedrich

  2. Department of Ophthalmology, University of Iowa, Iowa City, Iowa, USA

    Karl C. Ossoinig

Authors
  1. Johannes Nepp
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  2. Katharina Krepler
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  3. Kerstin Jandrasits
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  4. Wolfgang Hauff
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  5. Georg Hanselmayer
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  6. Michaela Velikay-Parel
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  7. Karl C. Ossoinig
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  8. Andreas Wedrich
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Correspondence to Johannes Nepp.

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There was no private or public financial support for this study.

The authors have no proprietary or financial interest in any product mentioned in this article.

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Nepp, J., Krepler, K., Jandrasits, K. et al. Biometry and refractive outcome of eyes filled with silicone oil by standardized echography and partial coherence interferometry. Graefe's Arch Clin Exp Ophthalmo 243, 967–972 (2005). https://doi.org/10.1007/s00417-004-1117-2

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  • DOI: https://doi.org/10.1007/s00417-004-1117-2

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